4.MD.7 Additive Angles

Front

What is an angle?

Back

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

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is the sum of angles in a triangle?

Back

The sum of the angles in a triangle is always 180 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

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

If one angle measures 62 degrees, what is the measure of the other angle if they are complementary?

Back

The other angle measures 28 degrees (90 - 62 = 28).

Front

If one angle measures 44 degrees, what is the measure of the other angle if they are supplementary?

Back

The other angle measures 136 degrees (180 - 44 = 136).

Front

What is the formula to find the sum of angles in a polygon?

Back

The sum of the interior angles of a polygon is (n - 2) × 180 degrees, where n is the number of sides.