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18 Cards in this Set
- Front
- Back
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point
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has no dimension and represented by a dot.
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line
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one dimensional and represented by a line with two arrowheads
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Collinear points
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Points that exist on the same line.
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Coplanar points
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Points that exist on the same plane.
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Line segment
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A part of a line that is bounded by two endpoints.
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Ray
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A line which starts at a point and goes off in a particular direction to infinity.
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Postulate
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A rule that is accepted without proof.
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Midpoint
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The point that divides the segment into two congruent segments.
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Segment bisector
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a point, ray, line segment, or plane that intersect a segment at its midpoint.
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Angle bisector
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A ray that divides an angle into two angles that are congruent.
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Supplementary angles
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two angles whose sum is 180°
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Complementary Angles
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two angles whose sum is 90°
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Adjacent Angles
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two angles that share a common vertex and side.
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Linear pair
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Two adjacent angles are a linear pair if their non common sides are opposite rays.
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Vertical Angles
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Two angles are vertical if their sides form two opposite rays.
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Convex polygons
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no line that contains a side of the polygon contains a point in the interior of the polygon.
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Concave polygons
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a polygon that is not convex. Also called non convex.
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Plane
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two dimensions, flat surface. Through any 3 points not on the same line, there is exactly one plane.
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