Interior Angles of a Triangle

Front

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

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

What is the measure of the third angle if two angles of a triangle are 70 degrees and 50 degrees?

Back

The third angle measures 60 degrees.

Front

What do you call a triangle with all angles less than 90 degrees?

Back

It is called an acute triangle.

Front

What do you call a triangle with one angle greater than 90 degrees?

Back

It is called an obtuse triangle.

Front

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

Back

It is an isosceles triangle.

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.

Front

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

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

If the angles of a triangle are in the ratio 2:3:4, what are the measures of the angles?

Back

The angles measure 40 degrees, 60 degrees, and 80 degrees.

Front

What is the relationship between the angles in a triangle and a straight line?

Back

The angles in a triangle add up to 180 degrees, which is the same as a straight line.