Geometry Unit 2A Test Review (Lines, Angles and Triangles)

Front

What is an exterior angle?

Back

An exterior angle is formed by one side of a polygon and the extension of an adjacent side. It is equal to the sum of the two remote interior angles.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always congruent (equal in measure).

Front

What does it mean for angles to be congruent?

Back

Congruent angles are angles that have the same measure.

Front

What are supplementary angles?

Back

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

Front

If angle A measures 36 degrees, what is the measure of its supplementary angle?

Back

The supplementary angle measures 144 degrees (180 - 36 = 144).

Front

What is the relationship between corresponding angles when two parallel lines are cut by a transversal?

Back

Corresponding angles are equal when two parallel lines are cut by a transversal.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

If two angles are complementary, what is the sum of their measures?

Back

The sum of complementary angles is 90 degrees.

Front

What is the definition of a triangle?

Back

A triangle is a polygon with three edges and three vertices.

Front

How do you find the measure of an unknown angle in a triangle?

Back

To find the measure of an unknown angle in a triangle, subtract the sum of the known angles from 180 degrees.