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Lines and Angles
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Middle School
LinesAngles
Topic outline
Lines and Angles
Geometric Objects
Definitions
Page
Types of Angles
Definitions and Examples
Page
Using a Protractor
Practice
Page
Angles in Polygons
Investigate
Page
Angles in a Star
Investigate
Page
Sum of the Angles in a Triangle
Investigate
Page
Why is the Sum Always 180º?
Page
Why is the Sum Always 180º? A Different Look
Page
Find the Missing Angle
Page
Complementary Angles
Definition and Examples
Page
Practice - Find the Missing Angle
Page
Supplementary Angles
Definition and Examples
Page
Practice - Find the Missing Angle
Page
Vertical Angles
Definition and Examples
Page
Practice
Find the Missing Angles with a Triangle on a Line
Page
Find the Missing Angle on a Line
Page
LinesAngles
Lines and Angles
Geometric Objects
Types of Angles
Using a Protractor
Angles in Polygons
Angles in a Star
Sum of the Angles in a Triangle
Complementary Angles
Supplementary Angles
Vertical Angles
Practice
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