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# Angles & Triangles

### Math Chapter 13-1, 13-2, 13-4

Angle has 2 sides that share a common endpoint that is called the vertex
Right Angle exactly 90 degrees
Acute Angle less than 90 degrees (0-89 degrees)
Obtuse Angle more than 90 degrees (91-180 degrees)
Straight Angle exactly 180 degrees
Reflex Angle more than 180 degrees (181-360 degrees)
Complementary Angles angles that add up to 90 degrees
Supplementary Angles angles that add up to 180 degrees
Polygon 3 or more sides, closed figure, 2 dimensional
Regular Polygon all sides of the figure have the same length, all the angles inside the figure have the same measure
Triangle 3 sides, 180 degrees
Pentagon 5 sides, 540 degrees
Hexagon 6 sides, 720 degrees
Heptagon 7 sides, 900 degrees
Octagon 8 sides, 1,080 degrees
Scalene Triangle no sides are the same length
Isosceles Triangle 2 sides have the same length
Equilateral Triangle all sides have the same length
Right Triangle has one 90 degree angle
Obtuse Triangle have one angle greater than 90 degrees
Acute Triangle all angles are less than 90 degrees
Created by: Mills, Susan