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

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 an exterior angle of a triangle?

Back

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

Front

If one angle of a triangle is 60 degrees and another is 50 degrees, what is the measure of the third angle?

Back

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

Front

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

Back

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

Front

If angle A is 45 degrees and angle B is 75 degrees, what is angle C?

Back

Angle C is 60 degrees (180 - 45 - 75 = 60).

Front

What is the measure of an angle that is supplementary to a 120-degree angle?

Back

The supplementary angle measures 60 degrees (180 - 120 = 60).

Front

What is the measure of an angle that is complementary to a 30-degree angle?

Back

The complementary angle measures 60 degrees (90 - 30 = 60).

Front

If angle D is 90 degrees, what type of triangle is formed with angle E measuring 30 degrees?

Back

A right triangle is formed, as it has one 90-degree angle.

Front

What is the measure of angle x if angle y is 45 degrees and angle z is 45 degrees?

Back

Angle x measures 90 degrees (180 - 45 - 45 = 90).