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

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

Back

It is a right triangle.

Front

What is 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

How do you calculate the measure of an exterior angle?

Back

The measure of an exterior angle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

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

Back

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

Front

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

Back

Each interior angle of a triangle is supplementary to its corresponding exterior angle.

Front

What is the formula to find the measure of an interior angle in a regular polygon?

Back

The formula is (n-2) * 180/n, where n is the number of sides.

Front

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

Back

Each interior angle in an equilateral triangle measures 60 degrees.

Front

If one angle of a triangle is 25 degrees, what is the maximum possible measure of the other two angles?

Back

The maximum possible measure of the other two angles is 155 degrees (180 - 25 = 155).

Front

What is the definition of complementary angles?

Back

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