2.
Point a zero-dimensional figure; while usually left undefined, has four main representations - the dot, the node, the location, and the ordered pair of numbers.
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Line (Segment) A straight line which links two points without extending beyond them.
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Plane A two-dimensional group of points that goes on infinitely in all directions; made up of infinite lines.
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Angle A shape, formed by two lines or rays diverging from a common point (the vertex).
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Perpendicular Lines A line is perpendicular to another if it meets or crosses it at right angles (90°).
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Parallel Lines Lines are parallel if they lie in the same plane, and are the same distance apart over their entire length.
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Triangle A closed figure consisting of three line segments linked end-to-end. A 3-sided polygon.
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Right Triangle A triangle where one of its interior angles is a right angle (90 degrees).
10.
Pentagon A number of coplanar line segments, each connected end to end to form a closed shape.
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