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6
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A polygon with three edges and three vertices
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8
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Two angles and an included side
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9
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are a pair of angles on the inner side of each of those two lines but on opposite sides of the transversal.
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10
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a pair of angles on the outer side of each of those two lines but on opposite sides of the transversal.
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11
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of congruence states that an angle, line segment, or shape is always congruent to itself.
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12
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Two sides and an included angle
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13
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Three pairs of congruent sides
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14
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Angles that are in the same corner of each intersection
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15
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line segment that bisects one of the vertex angles of a triangle.
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16
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the sum of the three interior angles in a triangle is always 180°.
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17
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two lines that meet or intersect each other at right angles (90°).
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18
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Two lines intersected by a transversal
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