Interior and Exterior Angles of a Triangle

Front

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

Back

180 degrees.

Front

How do you find a missing angle in a triangle?

Back

Add the other two angles and subtract from 180 degrees.

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of the triangle and the extension of an adjacent side.

Front

What is the relationship between an exterior angle and the two opposite interior angles?

Back

The exterior angle is equal to the sum of the two opposite interior angles.

Front

If one angle of a triangle is 50 degrees and another is 60 degrees, what is the third angle?

Back

70 degrees (180 - 50 - 60 = 70).

Front

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

Back

Each angle measures 60 degrees.

Front

In a right triangle, what is the measure of the right angle?

Back

90 degrees.

Front

If two angles of a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

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

Back

Sum = Angle 1 + Angle 2 + Angle 3 = 180 degrees.

Front

If angle A is 40 degrees and angle B is 70 degrees, what is angle C?

Back

Angle C is 70 degrees (180 - 40 - 70 = 70).