Angles and Triangles

Front

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

Back

180 degrees.

Front

If one angle of a triangle measures 45 degrees, and another angle measures 65 degrees, what is the measure of the third angle?

Back

The measure of the third angle is 70 degrees.

Front

What type of angle measures exactly 90 degrees?

Back

Right angle.

Front

In a right triangle, if one acute angle measures 30 degrees, what is the measure of the other acute angle?

Back

60 degrees.

Front

Which of the following triangles has at least two equal sides?

Back

Isosceles triangle.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What is an equilateral triangle?

Back

A triangle with all three sides equal and all angles measuring 60 degrees.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.