Angle Measures of Triangles

Front

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

Back

180 degrees.

Front

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

Back

Right triangle.

Front

What do you call a triangle with all sides of different lengths?

Back

Scalene triangle.

Front

What do you call a triangle with at least two equal sides?

Back

Isosceles triangle.

Front

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

Back

60 degrees.

Front

If two angles of a triangle are 30 degrees and 60 degrees, what is the measure of the third angle?

Back

90 degrees.

Front

What is the relationship between the angles in a triangle?

Back

The sum of the angles is always 180 degrees.

Front

If one angle of a triangle is 40 degrees and another is 100 degrees, what is the third angle?

Back

40 degrees.

Front

What is an exterior angle of a triangle?

Back

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

Front

How do you find the measure of an exterior angle of a triangle?

Back

It is equal to the sum of the two opposite interior angles.