Geometric terms
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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Angle | Formed when two rays or line segments meet at a common vertex
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Vertex | a point where two or more straight lines meet.
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Ray | starts at a given point and goes off in a certain direction forever, to infinity.
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Line Segment | a straight line with two end points; contains every point on the line between its end points
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Right Angle | forms a square corner and measures 90 degrees
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Straight Angle | forms a straight line and measures 180 degrees
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Acute Angle | is smaller than a right angle and measures less than 90 degrees.
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Obtuse Angle | is larger than a right angle and measures more than 90 degrees, but less than 180 degrees.
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Congruent | figures that have the same shape and same size
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Similar | figures that have the same shape
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Symmetry | a figure is symmetrical if, when folded down the middle, it has two matching halves.
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Line of Symmetry | the folded line when finding symmetry.
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Polygon | flat shape consisting of straight lines that are joined to form a closed chain or circuit; means many
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Triangle | a polygon that has 3 sides
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Quadrilateral | a polygon that has 4 sides
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Pentagon | a polygon that has 5 sides
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Hexagon | a polygon that has 6 sides
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Heptagon | a polygon that has 7 sides
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Octagon | a polygon that has 8 sides
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Nonagon | a polygon that has 9 sides
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Decagon | a polygon that has 10 sides
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Created by:
auriel
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