Angle Relationships and Triangles

Front

What are vertical angles?

Back

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

Tags

CCSS.7.G.B.5

Front

If m∠1 = 30°, what is m∠3 if ∠1 and ∠3 are vertical angles?

Back

m∠3 = 30° because vertical angles are equal.

Tags

CCSS.7.G.B.5

Front

What are complementary angles?

Back

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

Tags

CCSS.7.G.B.5

Front

What are supplementary angles?

Back

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

Tags

CCSS.7.G.B.5

Front

If two angles are supplementary and one angle measures 130°, what is the measure of the other angle?

Back

The other angle measures 50° because 180° - 130° = 50°.

Tags

CCSS.7.G.B.5

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°.

Tags

CCSS.8.G.A.5

Front

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

Back

It is a right triangle.

Tags

CCSS.4.G.A.2

Front

What is an acute angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

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

Tags

CCSS.4.G.A.1

Front

If m∠A = 40° and m∠B = 140°, are angles A and B complementary or supplementary?

Back

They are supplementary because 40° + 140° = 180°.

Tags

CCSS.7.G.B.5