Triangle Sum Theorem

Front

What is the Triangle Sum Theorem?

Back

The Triangle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

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

Back

It is a right triangle.

Front

What is the measure of the third angle in a triangle if the other two angles measure 45° and 60°?

Back

75°

Front

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

Back

Subtract the sum of the known angles from 180°.

Front

What are the three types of angles based on their measures?

Back

Acute (less than 90°), Right (exactly 90°), and Obtuse (greater than 90° but less than 180°).

Front

If a triangle has angles measuring 50° and 60°, what is the measure of the third angle?

Back

70°.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

In a triangle, if one angle is 130°, what can you say about the other two angles?

Back

They must be acute angles, as the sum of all angles must equal 180°.