Triangle Angle Sum Theorem

Front

What does the Triangle Angle Sum Theorem state?

Back

The sum of the interior angles of 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 the third angle in a triangle if the other two angles are known?

Back

Subtract the sum of the two known angles from 180 degrees.

Front

What are the measures of the angles in a triangle that can form a valid triangle?

Back

The measures must be positive and their sum must equal 180 degrees.

Front

If two angles of a triangle are 45° and 65°, what is the measure of the third angle?

Back

The third angle is 70°.

Front

What is the measure of the third angle in a triangle with angles of 34° and 101°?

Back

The third angle is 45°.

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, two angles are equal.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle measures 60 degrees.

Front

If one angle of a triangle is 60 degrees and the other is 80 degrees, what is the measure of the third angle?

Back

The third angle is 40 degrees.

Front

What is the formula to calculate the sum of angles in a triangle?

Back

The formula is: Angle1 + Angle2 + Angle3 = 180 degrees.