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The Area of a Triangle
“Base x height ÷ 2 = the area”
E.g :
Base = 3
Height = 4
3 x 4 ÷ 2 = 6
Area = 6

The Area of a Trapezium
“(Lower Base + Upper Base) x Height ÷ 2 = the area”
E.g :
Lower Base : 6
Upper Base : 9
Height : 4
(6+9) x 4 ÷ 2 = 30
Area = 30

The Area of a Parallelogram
“Base x Height = the area”
E.g :
Base : 3
Height : 23
3 x 23 = 69
Area = 69

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Triangle :base×hight ÷2

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https://www.youtube.com/watch?v=s8OPoot0IUg

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area of parallelogram

base x height

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https://www.youtube.com/watch?v=jWX9KNToIcA

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https://www.youtube.com/watch?v=D10Eda9nHXY

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Area of a Trapezium : How to Calculate the Area Easily : Maths Revision Video

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A

=

a

+

b

2

h

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Base x height
Example:7x8=56

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Area of a parallelogram, to figure it out, we need to base x height

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trapezoid
add both bases - half

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wiki links: https://en.wikipedia.org/wiki/Parallelogram#:~:text=The%20area%20of%20a%20parallelogram,product%20of%20two%20adjacent%20sides.

https://simple.wikipedia.org/wiki/Trapezoid#:~:text=To%20calculate%20the%20area%20of,times%20that%20by%20its%20height

https://en.wikipedia.org/wiki/Triangle

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In Euclidean geometry, a parallelogram is a simple (non- self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence of opposite sides and opposite angles is a direct consequence of the Euclidean parallel postulate and neither condition can be proven without appealing to the Euclidean parallel postulate or one of its equivalent formulations.

By comparison, a quadrilateral with just one pair of parallel sides is a trapezoid in American English or a trapezium in British English.

The three-dimensional counterpart of a parallelogram is a parallelepiped.

The etymology (in Greek παραλληλ-όγραμμον, parallēl-ógrammon, a shape "of parallel lines") reflects the definition.

Rectangle - A parallelogram with four angles of equal size (right angles).

Rhombus - A parallelogram with four sides of equal length. Any parallelogram that is neither a rectangle nor a rhombus was traditionally called a rhomboid but this term is not used in modern mathematics.

Square - A parallelogram with four sides of equal length and angles of equal size (right angles).

A simple (non-self-intersecting) quadrilateral is a parallelogram if and only if any one of the following statements is true:

Two pairs of opposite sides are parallel (by definition).

Two pairs of opposite sides are equal in length.

Two pairs of opposite angles are equal in measure.

The diagonals bisect each other.

One pair of opposite sides is parallel and equal in length.

Adjacent angles are supplementary.

Each diagonal divides the quadrilateral into two congruent triangles.

The sum of the squares of the sides equals the sum of the squares of the diagonals. (This is the parallelogram law.)

It has rotational symmetry of order 2.

The sum of the distances from any interior point to the sides is independent of the location of the point. (This is an extension of Viviani's theorem.)

There is a point X in the plane of the quadrilateral with the property that every straight line through X divides the quadrilateral into two regions of equal area.

Thus all parallelograms have all the properties listed above, and conversely, if just one of these statements is true in a simple quadrilateral, then it is a parallelogram.

Opposite sides of a parallelogram are parallel (by definition) and so will never intersect.

The area of a parallelogram is twice the area of a triangle created by one of its diagonals.

The area of a parallelogram is also equal to the magnitude of the vector cross product of two adjacent sides.

Any line through the midpoint of a parallelogram bisects the area.

Any non-degenerate affine transformation takes a parallelogram to another parallelogram.

A parallelogram has rotational symmetry of order 2 (through 180°) (or order 4 if a square). If it also has exactly two lines of reflectional symmetry then it must be a rhombus or an oblong (a non-square rectangle). If it has four lines of reflectional symmetry, it is a square.

The perimeter of a parallelogram is 2(a + b) where a and b are the lengths of adjacent sides.

Unlike any other convex polygon, a parallelogram cannot be inscribed in any triangle with less than twice its area.

The centers of four squares all constructed either internally or externally on the sides of a parallelogram are the vertices of a square.

If two lines parallel to sides of a parallelogram are constructed concurrent to a diagonal, then the parallelograms formed on opposite sides of that diagonal are equal in area.

The diagonals of a parallelogram divide it into four triangles of equal area.

All of the area formulas for general convex quadrilaterals apply to parallelograms. Further formulas are specific to parallelograms:

A parallelogram with base b and height h can be divided into a trapezoid and a right triangle, and rearranged into a rectangle, as shown in the figure to the left. This means that the area of a parallelogram is the same as that of a rectangle with the same base and height:

The base × height area formula can also be derived using the figure to the right. The area K of the parallelogram to the right (the blue area) is the total area of the rectangle less the area of the two orange triangles. The area of the rectangle is

and the area of a single orange triangle is

Therefore, the area of the parallelogram is

Another area formula, for two sides B and C and angle θ, is

The area of a parallelogram with sides B and C ( B ≠ C) and angle at the intersection of the diagonals is given by[9]

When the parallelogram is specified from the lengths B and C of two adjacent sides together with the length D ₁ of either diagonal, then the area can be found from Heron's formula. Specifically it is

where and the leading factor 2 comes from the fact that the chosen diagonal divides the parallelogram into two congruent triangles.

Let vectors and let denote the matrix with elements of a and b. Then the area of the parallelogram generated by a and b is equal to .

Let vectors and let . Then the area of the parallelogram generated by a and b is equal to .

Let points . Then the area of the parallelogram with vertices at a, b and c is equivalent to the absolute value of the determinant of a matrix built using a, b and c as rows with the last column padded using ones as follows:

To prove that the diagonals of a parallelogram bisect each other, we will use congruent triangles:

(alternate interior angles are equal in measure)

(alternate interior angles are equal in measure).

(since these are angles that a transversal makes with parallel lines AB and DC).

Also, side AB is equal in length to side DC, since opposite sides of a parallelogram are equal in length.

Therefore, triangles ABE and CDE are congruent (ASA postulate, two corresponding angles and the included side).

Therefore,

Since the diagonals AC and BD divide each other into segments of equal length, the diagonals bisect each other.

Separately, since the diagonals AC and BD bisect each other at point E, point E is the midpoint of each diagonal.

Parallelograms can tile the plane by translation. If edges are equal, or angles are right, the symmetry of the lattice is higher. These represent the four Bravais lattices in 2 dimensions.

Form

Square

Rectangle

Rhombus

Parallelogram

System

Square
(tetragonal)

Rectangular
(orthorhombic)

Centered rectangular
(orthorhombic)

Oblique
(monoclinic)

Constraints

α=90°, a=b

α=90°

a=b

None

Symmetry

p4m, [4,4], order 8 n

pmm, [∞,2,∞], order 4 n

p1, [∞⁺,2,∞⁺], order 2 n

Form

An automedian triangle is one whose medians are in the same proportions as its sides (though in a different order). If ABC is an automedian triangle in which vertex A stands opposite the side a, G is the centroid (where the three medians of ABC intersect), and AL is one of the extended medians of ABC with L lying on the circumcircle of ABC, then BGCL is a parallelogram.

The midpoints of the sides of an arbitrary quadrilateral are the vertices of a parallelogram, called its Varignon parallelogram. If the quadrilateral is convex or concave (that is, not self-intersecting), then the area of the Varignon parallelogram is half the area of the quadrilateral.

For an ellipse, two diameters are said to be conjugate if and only if the tangent line to the ellipse at an endpoint of one diameter is parallel to the other diameter. Each pair of conjugate diameters of an ellipse has a corresponding tangent parallelogram, sometimes called a bounding parallelogram, formed by the tangent lines to the ellipse at the four endpoints of the conjugate diameters. All tangent parallelograms for a given ellipse have the same area.

It is possible to reconstruct an ellipse from any pair of conjugate diameters, or from any tangent parallelogram.

A parallelepiped is a three-dimensional figure whose six faces are parallelograms.

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In Euclidean geometry, a parallelogram is a simple (non- self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure.

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area of triangle
height: 6
base: 7
6x7=42
42➗2= 21

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So, the area
AA of a triangle is given by the formula
A=
1
2
bhA=12bh where
bb is the base and
hh is the height of the triangle.

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base x height divide 2

Example:8 height and base 8 =64 divide 2=
34

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Area of a trapezium
to figure it our, we need to (base+base) x height divide by 2.

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A = 1/2 × b × h.
We can work this as
4 x 3*2=6

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triangle
base x height - half

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Area of a triangle
Base x height divide by 2

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The area of a parallelogram is twice the area of a triangle created by one of its diagonals. The area of a parallelogram is also equal to the magnitude of the vector cross product of two adjacent sides.

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parallelogram
base x height

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To calculate the area of a trapezoid, you must add the two parallel sides together, divide that by 2, then times that by its height

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SQUARE
Base x Height

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Area of a triangle

to figure it our, we need to base x height then divide it by 2.

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Area of a parallelogram

height x base

for example
base:3
height:2
area:6

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A = ( a + b ) 2 × h .
We can work this as
(5+12)x4*2=34

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Area of a Trapezoid: (Upper Base + Lower Base) x Height ÷ 2
For example: Upper Base = 4, Lower Base = 3, Height = 6, Area = (4 + 3) x 6 ÷ 2 = 21

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Area of a parallelogram: Base x Height

Base: 3

Height: 10

Area= 30

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base x height ÷ 2          Triangle
Base x height                 parallelogram
base 1 +base 2 x height ÷2
trapezium

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Area of a Parallelogram: Base x Height.
For example: Base = 6, Height = 2, Area = 12

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The area of this parallelogram is its height (half-height of the trapezoid) times its base (sum of the bases of the trapezoid), so its area is half-height × (base1 + base2).

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Find the area of a triangle etc. height = 5 cm and width = 8 cm. 5 × 8 = 40 ÷ 2 = 20 The area is 20cm².

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Triangle: Base x hight, ➗2

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https://www.omnicalculator.com/math/triangle-area

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A triangle is one of the most basic shapes in geometry. The best known and the simplest formula, which almost everybody remembers from school is:

area = 0.5 * b * h, where b is the length of the base of the triangle, and h is the height/altitude of the triangle.

However, sometimes it's hard to find the height of the triangle. In that cases, many other equations may be used, depending on what is known about the triangle:

Two sides and the angle between them (SAS)
You can calculate area of a triangle easily from trigonometry:
area = 0.5 * a * b * sin(γ)

Two angles and a side between them (ASA)
There are different triangle area formulas versions - you can use for example trigonometry or law of sines to derive it:
area = = a² * sin(β) * sin(γ) / (2 * sin(β + γ))

If you are looking for other formulas or calculators connected with triangle, check out this right triangle calculator, pythagorean theorem calculator and law of cosines calculator.

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A triangle is one of the most basic shapes in geometry. The best known and the simplest formula, which almost everybody remembers from school is: area = 0.5 * b * h, where b is the length of the base of the triangle, and h is the height/altitude of the triangle.

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Area of a Triangle: Base x Height ÷ 2.
For example: Base = 5, Height = 4, 5x4÷2=10