Finding Missing Angles in Triangles

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

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

Back

It is a right triangle.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

If two angles of a triangle are 45 degrees each, what is the third angle?

Back

The third angle is 90 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

If two angles of a triangle are 30 degrees and 70 degrees, what is the third angle?

Back

The third angle is 80 degrees.

Front

What is the measure of the missing angle if the known angles are 34 degrees and 101 degrees?

Back

The missing angle is 45 degrees.

Front

If the angles of a triangle are represented as x, 2x, and 3x, what is the value of x?

Back

x = 30 degrees, making the angles 30, 60, and 90 degrees.

Front

What is the relationship between the angles in a triangle?

Back

The angles in a triangle are supplementary, meaning they add up to 180 degrees.