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An object shaped like a cone is said to be conical

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Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

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SOLUTION: What is the characteristics/ facts about circumference

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Remark: It's too bad that pi didn't come out to be a nice number like 3. In the Bible, 1 Kings 7:23 reads: "And he made a molten sea ten cubits from the one brim to the other it was round all about...and a line of thirty cubits.

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In geometry, a cuboid is a convex polyhedron bounded by six quadrilateral faces, whose polyhedral graph is the same as that of a cube. used for boxes length*width*height

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a parallelogram with four right angles. We use rectangles for pizza boxes. Add all the sides. L*W

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A sphere is a perfectly round geometrical and circular object in three-dimensional space that resembles the shape of a completely round ball. are used for balls.

A sphere is a perfectly round three dimensional shape similar to a round ball you might play soccer or basketball with.

All points on the surface of a sphere are the same distance from the center.

A sphere is perfectly symmetrical around its center.

The distance from the center of a sphere to its surface is called the radius.

The maximum distance through the sphere is called the diameter, it is twice the size of the radius.

sphere = (4/3) pi r 3

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A cone is a three-dimensional geometric shape that tapers smoothly from a flat base to a point called the apex or vertex. for icecream cones Cone = (1/3) b h = 1/3 pi r 2 h

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a solid geometric figure with straight parallel sides and a circular or oval section. containers for juice. cylinder = b h = pi r 2 h.

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a symmetrical three-dimensional shape, either solid or hollow, contained by six equal squares cubes are used for ice and for boxes cube = a 3.

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a four-sided plane rectilinear figure with opposite sides that are parallel. Area = b x h. Perimeter = a + b + a + b

house bases

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A convex quadrilateral with at least one pair of parallel sides is referred to as a trapezoid

Called a "Trapezium" in the UK

perimeter = a+b+c+d area=(b1+b2)*h/2

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A polygon with three corners or vertices and three sides or edges which are line segments. We use triangles for pizza. B*H/2

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The Definition of a Triangle

Examples of Triangles

A triangle is a special kind of shape.

What do you think makes a shape a triangle?

Be sure to think about this question before going on with the lesson

Properties of triangles

Before we decide exactly what makes a shape a triangle, we need to understand what a closed figure is.

A figure is closed if all its sides are connected.

These figures are closed.

These figures are not closed.

A triangle is a closed figure with three sides.

Use this definiton to figure out which of the following shapes are triangles and which are not.

Click here to check your answers.

Can you think of any triangles that you see in your everyday life?

(Hint: look at bridges or radio towers.)

Classification of Triangles

There are many different kinds of triangles.

The following table outlines some basic types of triangles.

Triangles: Everything you ever wanted to know about them

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The Definition of a Triangle Examples of Triangles A triangle is a special kind of shape. What do you think makes a shape a triangle? Be sure to think about this question before going on with the lesson Properties of triangles Before we decide exactly what makes a shape a triangle, we need to understand what a closed figure is.

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in geometry, a square is a regular quadrilateral. This means that it has four equal sides and four equal angles. It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices ABCD would be denoted ABCD. Area=L*W

Perimeter= L+W+L+W

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a round plane figure whose boundary consists of points equidistant from a fixed point

factiods

it looks like a cookie used for pans

Circumference   =   2 • π • radius   =  π • diameterCircle Area   =      π • r²    =    ¼ • π • d²

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the amount of 3-dimensional space occupied by an object. to measure beds and boxes

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Area is a quantity that expresses the extent of a two-dimensional surface or shape, or planar lamina, in the plane. t find the area of the floor

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The linear distance around the edge of a closed curve or circular object. to make like cookies and cake.

The circumference of a circle—the complete distance around a circle—can be found by using this formula:

C = π2r, in which π is about 3.1416 and r is the radius.

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the continuous line forming the boundary of a closed geometric figure

The perimeter of a circle is called the circumference.

to measure the perimeter of the room or a fence. The perimeter of a geometrical figure is the complete distance around that figure. To find the perimeter, simply add up the lengths of the figure's sides.