Interior and Exterior Angles of Triangles

Front

What is the total sum of the interior angles of a triangle?

Back

180 degrees

Front

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

Back

Acute angle

Front

What is the measure of an angle that is exactly 90 degrees?

Back

Right angle

Front

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

Back

Obtuse angle

Front

What is the measure of a straight angle?

Back

180 degrees

Front

If one angle of a triangle measures 60 degrees and another measures 90 degrees, what is the measure of the third angle?

Back

30 degrees

Front

In a triangle, if two angles measure 45 degrees each, what is the measure of the third angle?

Back

90 degrees

Front

What is the relationship between the exterior angle and the two opposite interior angles in a triangle?

Back

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

Front

If one angle of a triangle is 105 degrees, what is the maximum possible measure of the other two angles?

Back

75 degrees (the other two angles must sum to 75 degrees).

Front

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

Back

60 degrees