Interior angles in triangles

Front

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

Back

180 degrees

Front

What type of angle measures exactly 90 degrees?

Back

Right angle

Front

In an equilateral triangle, what is the measure of each angle?

Back

60 degrees

Front

If one angle of a triangle is 90 degrees and another is 45 degrees, what is the measure of the third angle?

Back

45 degrees

Front

What is the definition of an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is the definition of an obtuse angle?

Back

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

Front

How do you find the measure of an unknown angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the relationship between the angles in a right triangle?

Back

One angle is 90 degrees, and the sum of the other two angles is 90 degrees.

Front

What is the formula for the sum of the interior angles of a polygon?

Back

(n-2) * 180 degrees, where n is the number of sides.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.