Find the missing angle

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex).

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180 degrees.

Front

What is a right angle?

Back

A right angle measures 90 degrees.

Front

What is an acute angle?

Back

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

Front

What is an obtuse angle?

Back

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

Front

How do you find a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is a straight angle?

Back

A straight angle measures 180 degrees.

Front

What is the equation to find a missing angle when two angles are known?

Back

Missing angle = 180 - (angle 1 + angle 2) for a straight line.

Front

What is the relationship between complementary angles?

Back

Complementary angles are two angles that add up to 90 degrees.

Front

What is the relationship between supplementary angles?

Back

Supplementary angles are two angles that add up to 180 degrees.