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°.

Front

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

Back

It is a right triangle.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Front

How do you find the missing angle in a triangle?

Back

To find the missing angle, subtract the sum of the known angles from 180°.

Front

If two angles of a triangle are 45° and 90°, what is the measure of the third angle?

Back

The third angle measures 45°.

Front

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

Back

In an isosceles triangle, the two angles opposite the equal sides are equal.

Front

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

Back

Each angle in an equilateral triangle measures 60°.

Front

If a triangle has angles measuring 29° and 39°, what is the measure of the third angle?

Back

The third angle measures 112°.

Front

What is the definition of a triangle?

Back

A triangle is a polygon with three edges and three vertices.