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1
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the distance around a 2-D figure
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2
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a line segment with endpoints on the midpoints of two sides of a triangle (it's parallel to the opposite side, and half the length of that side)
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3
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a five sided polygon
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4
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a six sided polygon
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5
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a flat surface that extends forever
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6
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an exact location in space
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7
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recognizing patterns to make predictions
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9
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two angles that share a vertex and one side and whose non-shared sides form a line
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15
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a line segment with one endpoint on a vertex of a triangle and one endpoint on the midpoint of the opposite side
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17
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a straight path that extends without end in opposite directions
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19
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an eight sided polygon
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20
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the two congruent sides of an isosceles triangle
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