Int/Ext Triangle Angles & Comp/Supp

Front

What is an interior angle of a triangle?

Back

An interior angle is formed by two sides of a triangle that meet at a vertex, and it is located inside the triangle.

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of a triangle and the extension of an adjacent side. It is located outside the triangle.

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

What is the relationship between an exterior angle and the interior angles of a triangle?

Back

An exterior angle is equal to the sum of the two opposite interior angles.

Front

What are complementary angles?

Back

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

Front

What are supplementary angles?

Back

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

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

If two angles in a triangle are 50 degrees and 60 degrees, what is the measure of the third angle?

Back

The third angle is 70 degrees (180 - 50 - 60 = 70).

Front

What is the measure of an exterior angle if one of the interior angles is 40 degrees?

Back

The exterior angle is 140 degrees (180 - 40 = 140).