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8
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two angles whose measures have a sum of 180 degrees
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9
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measuring exactly 180 degrees; makes a straight line
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10
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y = mx + b
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11
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a pair of opposite congruent angles formed by intersecting lines
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13
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a proof with a column for statements and a column for reasons
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14
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a ruler with no markings on it
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16
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the two nonadjacent interior angles corresponding to each exterior angle of a triangle (you can add them together to find the opposite exterior angle)
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17
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a polygon with congruent sides and angles
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18
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a triangle containing a right angle
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19
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the angle in an isosceles triangle that is opposite the side that is not congruent
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20
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a triangle with no congruent sides
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