Unit 9: Angles and Polygons Vocabulary

What are Supplementary Angles?

• Angles that add up to 90 degrees

• Angles that add up to 180 degrees

• Angles that are equal

• Angles that are complementary

Complementary angles are two angles whose measures add up to:

• 90 degrees

• 180 degrees

• 360 degrees

• 45 degrees

What are Vertical Angles?

• Angles that are adjacent to each other

• Angles that are opposite each other when two lines intersect

• Angles that add up to 90 degrees

• Angles that add up to 180 degrees

Adjacent angles are:

• Angles that share a common vertex and side

• Angles that are equal in measure

• Angles that are opposite each other

• Angles that form a straight line

An angle is formed by two rays with a common endpoint. What is this endpoint called?

• Vertex

• Base

• Apex

• Origin

A Ray is:

• A line with two endpoints

• A line with one endpoint

• A line with no endpoints

• A line segment

A Polygon is:

• A closed figure with straight sides

• A shape with curved sides

• A figure with only three sides

• A shape with no sides

A triangle is a polygon with how many sides?

• Two

• Three

• Four

• Five

An acute triangle is a triangle where:

• All angles are less than 90 degrees.

• One angle is exactly 90 degrees.

• One angle is more than 90 degrees.

• All angles are equal.

What is an obtuse triangle?

• A) A triangle with 1 right angle

• B) A triangle with 1 obtuse angle

• C) A triangle with 3 congruent sides