Interior and Exterior Angles of Triangles

Front

What is an acute angle?

Back

An angle that is less than 90 degrees.

Front

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

Back

180 degrees.

Front

What is an obtuse angle?

Back

An angle that is greater than 90 degrees but less than 180 degrees.

Front

What is a right angle?

Back

An angle that is exactly 90 degrees.

Front

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

Back

70 degrees.

Front

What is the exterior angle theorem?

Back

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

Front

How do you find the missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is a straight angle?

Back

An angle that is exactly 180 degrees.

Front

If a triangle has angles of 30 degrees and 60 degrees, what is the measure of the third angle?

Back

90 degrees.

Front

What is the relationship between interior and exterior angles?

Back

Interior angles are inside the triangle, while exterior angles are formed by extending one side of the triangle.