Math 8: Naming Angles

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What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

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What is the measure of a right angle?

Back

A right angle measures 90 degrees.

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What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

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What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

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What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

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What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on two parallel lines cut by a transversal. They are equal.

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What are alternate interior angles?

Back

Alternate interior angles are angles that lie between two parallel lines on opposite sides of a transversal. They are equal.

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What are alternate exterior angles?

Back

Alternate exterior angles are angles that lie outside two parallel lines on opposite sides of a transversal. They are equal.

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