Missing angles in triangles

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

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

Back

It is a right triangle.

Front

What do you call an angle that is less than 90 degrees?

Back

An acute angle.

Front

What do you call an angle that is greater than 90 degrees but less than 180 degrees?

Back

An obtuse 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

If two angles in a triangle are 50 degrees and 80 degrees, what is the measure of the third angle?

Back

The third angle is 50 degrees (180 - 50 - 80 = 50).

Front

What is the measure of the missing angle if the known angles are 70 degrees and 40 degrees?

Back

The missing angle is 70 degrees (180 - 70 - 40 = 70).

Front

In a triangle, if one angle is 60 degrees and another is 60 degrees, what type of triangle is it?

Back

It is an equilateral triangle.

Front

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

Back

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

Front

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

Back

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