Introduction to Angles Complementary and Supplementary.

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Introduction to Angles Complementary and Supplementary

Transcript of Introduction to Angles Complementary and Supplementary.

Page 1: Introduction to Angles Complementary and Supplementary.

Introduction to AnglesComplementary and Supplementary

Page 2: Introduction to Angles Complementary and Supplementary.

Lines, Rays, and Angles

A line goes forever in both directions.It is perfectly straight, and never ends.

A ray goes forever in one direction. It has one endpoint.

An angle is two rays that share an endpoint.

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Parts of an Angle• The point where the rays intersect is

called the vertex of the angle.

• The two rays are called the sides of the angle.

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Naming Angles• Use the vertex and a point from each ray to

name the angle. The vertex must be the middle letter. A

B C

Sometimes we put this symbol in front of an angle:

ABC

CBA

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Vertexes and Sides

                          

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Complementary Angles• Two angles are called complementary angles

if the sum (add) of their degree measurements equals 90 degrees.

• Complementary Angles make a Right Angle.

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Example:Complementary Angles

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Supplementary Angles

• Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees.

• Supplemental Angles make a Straight Line.

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Example:Supplementary Angles

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Find the complementary and supplementary angles for each.Use half sheet of paper.

1) 73 2) 40 3) 29

2) 87 5) 56 6) 13