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 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 remote interior angles?

Back

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

Front

If one angle of a triangle measures 60 degrees and another measures 70 degrees, what is the measure of the third angle?

Back

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

Front

What is a remote interior angle?

Back

A remote interior angle is an interior angle of a triangle that is not adjacent to a given exterior angle.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

If a triangle has angles measuring 45 degrees and 55 degrees, what is the measure of the third angle?

Back

The third angle measures 80 degrees (180 - 45 - 55 = 80).

Front

What is the definition of an interior angle?

Back

An interior angle is an angle formed by two sides of a triangle that meet at a vertex.

Front

What is the formula to calculate the exterior angle of a triangle?

Back

The exterior angle = sum of the two remote interior angles.