Interior and Exterior Angles of Triangles

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

Define an interior angle of a triangle.

Back

An interior angle of a triangle is formed by two sides of the triangle and is located inside the triangle.

Front

Define an exterior angle of a triangle.

Back

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

Front

What is the relationship between an exterior angle and the two opposite interior angles?

Back

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

Front

If one interior angle of a triangle is 70 degrees, what is the sum of the other two angles?

Back

The sum of the other two angles is 110 degrees (180 - 70 = 110).

Front

Solve for x: x + 34 = 90.

Back

x = 56.

Front

If a triangle has angles measuring 40 degrees and 60 degrees, what is the measure of the third angle?

Back

The third angle measures 80 degrees (180 - 40 - 60 = 80).

Front

What is the measure of an exterior angle if the interior angle is 72 degrees?

Back

The exterior angle measures 108 degrees (180 - 72 = 108).

Front

Solve for x: 2x + 10 = 70.

Back

x = 30.

Front

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

Back

It is a right triangle.