Geometry Words

By: Cassie Martin

Interior Angles

The angle between adjacent sides of a rectilinear figure.
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Exterior Angles

The angle between a side of a rectilinear figure and an adjacent side extended outward.
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Vertical Angles

Each of the pairs of opposite angles made by two intersecting lines.
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translation

Moving a shape, without rotating or flipping it. “sliding”.
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reflection

An image or shape as it would be seen in a mirror.

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rotation

A circular movement.


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dilation

To resize something.

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enlargement

To make larger.
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corresponding angles

The angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.


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scale factor

A number used as a multiplier in scaling.


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surface area

The total area of the surface of a three-dimensional object.


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volume

The amount of space that a substance or object occupies, or that is enclosed within a container, esp. when great.


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circumference

The enclosing boundary of a curved geometric figure, esp.


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supplementary angles

Either of two angles whose sum is 180°.


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Complementary angles

Either of two angles whose sum is 90°.

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