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 is 50 degrees and another is 60 degrees, what is the measure of the third angle?

Back

70 degrees.

Front

What type of angle measures exactly 90 degrees?

Back

Right angle.

Front

If a triangle has angles measuring 25 degrees and 55 degrees, what is the measure of the third angle?

Back

100 degrees.

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

In a triangle, if one angle is 48 degrees and another is 50 degrees, what is the measure of the third angle?

Back

82 degrees.

Front

If a triangle has angles measuring 62 degrees and 53 degrees, what is the measure of the third angle?

Back

65 degrees.

Front

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

Back

In a right triangle, one angle is 90 degrees, and the sum of the other two angles is 90 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.