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Angles and Triangles
Angles ,[object Object],ray —has one endpoint and goes infinitely in one direction vertex —point common to two rays of a triangle or two sides of a polygon  ray ray vertex
Types of Angles ,[object Object],[object Object],1 2 3 4 5
Types of Angles ,[object Object],[object Object],1 2 3 4 5
Types of Angles ,[object Object],[object Object],1 2 3 4 5
Straight Angle ,[object Object],[object Object],1 2 This is a ray.  It only goes in one direction.
Types of Triangles ,[object Object],These marks indicate equality.
Types of Triangles ,[object Object]
Types of Triangles ,[object Object],This box indicates a right angle or a 90-degree angle.
Types of Triangles ,[object Object]
Types of Triangles ,[object Object],1 2 3 4
Types of Triangles ,[object Object],Equilateral Right Isosceles Scalene 1 2 3 4
Interior Angles ,[object Object],[object Object]
Measuring Angles ,[object Object],Notice there are two scales.  Be careful which 0 you start at. 90 0 This point goes at the vertex of the angle This point is 0 This  point is 0.

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Angles and triangles