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1
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Half line extending forever in one direction
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5
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A quarter turn forms a ___________ angle
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8
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The sum of an angle and its ____________________ is 90 degrees
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10
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Supplementary angles between parallel lines
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12
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Type of angle between 0 and 90
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13
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A full turn
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14
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Position in space with no dimensions
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15
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Matching _____________ indicate lines are parallel
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16
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Line which intersects with parallel lines
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17
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A length extending forever in both directions
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18
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Measuring instrument for angles
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