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22 Cards in this Set
- Front
- Back
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Acute triangle
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All 3 angles are under 90 degrees
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Obtuse triangle
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1 angle is over 90 degrees
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Right triangle
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1 angle is 90 degrees
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Acute angle
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Angle that measures less than 90 degrees
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Obtuse angle
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Angle that measures more than 90 degrees
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Right angle
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Angle that is exactly 90 degrees
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Straight angle
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Two angles which add up to make 180 degrees ( and which form a straight line)
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Complementary angles
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2 angles which add up to 90 degrees
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Supplementary angles
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2 angles which add up to 180 degrees
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Special Right Triangles
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Either 30, 60, & 90 degrees
OR 45, 45, & 90 degrees |
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Baby, Mama, Poppa Triangle
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30, 60, 90 degree triangle
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Twin, Twin, Big Brother Triangle
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45, 45, 90 degree triangle
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Adjacent angles
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2 angles that share a common side
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Vertical angles
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A pair of non-adjacent angles formed by the intersection of two straight lines ( opposite angles in an X )
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Collinear
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Points on the same line
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Coplanar
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Points or lines that lie on the same plane
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Transversal
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A line that crosses 2 lines that are parallel to each other
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Parallel lines
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2 lines with the same slope.
They never touch each other |
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Perpendicular lines
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2 lines whose slopes multiply together to give -1. They intersect and form 4 right angles
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Intersection
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2 lines cross each other at a single point. 2 planes cross each other in a single line
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Similar triangles
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Have angles that match & proportional measurements for sides
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bisect or bisector
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Bisect means to divide into halves. A bisector divides the line or plane in halves.
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