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3
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Two lines that form a right angle at their point of intersection
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5
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A finite portion of a line that has two endpoints
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6
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Three or more points that lie in the same plane
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7
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A point that bisects a line segment
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8
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If three points are coplanar, than the line containing two of the points is in the same plane
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9
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Lines in the same plane that never intersect
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10
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A flat surface that extends infinitely in all directions
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11
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Three or more points that lie in the same line
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12
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Position in space, often represented by a dot
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13
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Two rays that share an endpoint and extend in opposite directions to form a line
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