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Half a circle. A closed shape consisting of half a circle and a diameter of that circle*

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A selection taken from a larger group (the "population") so that you can examine it to find out something about the larger group.

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A ratio says how much of one thing there is compared to another thing.

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A bar notation is a process of writing the repeating decimals or digits using bar symbol (over the repeating digits).

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Terms whose variables (and their exponents such as the 2 in x2) are the same.Example: 7x and 2x are like terms because the variables are both "x"
But 7x and 7x2 are NOT like terms (they are Unlike Terms)

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A pattern that you can cut and fold to make a model of a solid shape.

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A Mixed Fraction is a whole number and a proper fraction combined.Such as 1 3/4

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Divide by how many numbers (i.e. we added 3 numbers): 18 ÷ 3 = 6
So the Mean is 6

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An Obtuse Angle is more than 90° but less than 180°

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The highest elevation in North America is Mt. McKinley, which is 20,320 feet above sea level. The lowest elevation is Death Valley, which is 282 feet below sea level.

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When common factors exist on both sides of an equation, canceling can be done.

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Shows how many equal parts the item is divided into.

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If one shape can become another using Turns, Flips and/or Slides, then the shapes are Congruent:

After any of those transformations (turn, flip or slide),
the shape still has the same size, area, angles and line lengths.

Examples:

Here are 3 examples of shapes that are Congruent:

Congruent
(Rotated and Moved)

Congruent
(Reflected and Moved)

Congruent
(Reflected, Rotated and Moved)

Congruent or Similar?

The two shapes need to be the same size to be congruent.

When we need to resize one shape to make it the same as the other, the shapes are Similar.

When we ...

Then the shapes are ...

... only Rotate, Reflect and/or Translate

... also need to Resize

Congruent? Why such a funny word that basically means "equal"? Maybe because they are only "equal" when placed on top of each other. Anyway it comes from Latin congruere, "to agree". So the shapes "agree".

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If one shape can become another using Turns, Flips and/or Slides, then the shapes are Congruent: After any of those transformations (turn, flip or slide), the shape still has the same size, area, angles and line lengths.

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If one shape can become another using Turns, Flips and/or Slides, then the shapes .

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A right circular cone and an oblique circular cone

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A solid with six congruent square faces.

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Bottom line of a shape or bottom face of a solid object.

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area is the size of a surface.