Angles & Triangles - 6th grade

Front

What is an angle?

Back

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

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What is a vertical angle?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What is an adjacent angle?

Back

Adjacent angles are two angles that share a common side and a common vertex.

Front

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

Back

The sum of the angles in a triangle is always 180 degrees. Subtract the sum of the known angles from 180 to find the missing angle.

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is the measure of an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

What is the measure of an obtuse angle?

Back

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

Front

If one angle measures 130 degrees, what is the measure of its supplementary angle?

Back

The supplementary angle measures 50 degrees (180 - 130 = 50).