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Angles & Triangles
Math Chapter 13-1, 13-2, 13-4
Question | Answer |
---|---|
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 |
Quadrilateral | 4 sides, 360 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 |