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31 Cards in this Set
- Front
- Back
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point
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an exact location in space
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line
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An infinite set of points forming a straight path extending in opposite directions
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line segment
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A part of a line that consists of the two endpoints and all the points of the line between them.
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ray
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A part of a line that has one endpoint and extends infinitely in one direction.
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Midpoint:
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The point on a line segment that divides it into two equal segments.
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angle
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The union of two rays that share a common endpoint
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plane
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A flat surface with infinite length and width but no thickness.
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Collinear:
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On the same line.
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Perpendicular lines:
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Lines that intersect to form a right angle.
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Parallel lines
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Lines in the same plane that do not intersect
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Supplementary angles
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Two angles with measures whose sum is 180˚
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Interior angle
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An angle on the inside of a polygon, formed by the sides of the polygon (see GSP3).
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Exterior angle
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: An angle formed by the side of a polygon and an extension of an adjacent side. At each vertex, there are two exterior angles (see GSP3).
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Adjacent angles
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Angles that share a common ray and endpoint, but that do not overlap
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Linear pair
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A linear pair of angles is formed when two lines intersect. The angles are adjacent and formed by the two intersecting lines. Below, and are a linear pair.
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Vertex:
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The common endpoint of two rays or segments (plural: vertices)
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Polygon:
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A closed figure formed by line segments that meet only at their endpoints.
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Regular polygon
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A polygon that has all sides congruent and all angles congruent.
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Triangle:
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A three-sided polygon
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Quadrilateral:
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A four-sided polygon.
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Pentagon
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A five-sided polygon
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Hexagon
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A six-sided polygon
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Septagon
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A seven-sided polygon
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Octagon
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An eight-sided polygon.
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Nonagon
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A nine-sided polygon.
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Decagon:
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A ten-sided polygon.
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Interior angle
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An angle on the inside of a polygon, formed by the sides of the polygon (see GSP 3).
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Exterior angle
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An angle formed by the side of a polygon and an extension of an adjacent side. (see GSP 3)
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Linear pairs are supplementary.
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Linear pairs are supplementary.
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The sum of the interior angles of a convex polygon with n sides is 180(n – 2)0
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The sum of the interior angles of a convex polygon with n sides is 180(n – 2)0
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The sum of the exterior angles of all convex polygons is 360 degress.
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The sum of the exterior angles of all convex polygons is 3600.
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