Missing Angles in Triangles

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

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

Back

It is a right triangle.

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides that are equal in length.

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

Front

What is the measure of the third angle if two angles are 45° and 90°?

Back

The third angle measures 45°.

Front

If a triangle has angles measuring 60° and 70°, what is the measure of the missing angle?

Back

The missing angle measures 50°.

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths.

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides and angles equal, each measuring 60°.

Front

If one angle of a triangle is 25° and another is 105°, what is the measure of the third angle?

Back

The third angle measures 50°.

Front

What is the relationship between the angles in a triangle?

Back

The angles in a triangle are related such that their sum is always 180°.