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1
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Nonadjacent interior angles that lie on opposite sides of the transversal
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2
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Two angles whose sides are opposite rays
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3
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An 'if-then' statement
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4
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Axiom; an accepted statement of fact
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5
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A part of a line that consists of two endpoints and all points between
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6
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The process of making conjectures based on patterns
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7
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An angle that is greater than 0 degrees, but less than 90 degrees
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8
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Formed by two rays with the same endpoint
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9
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An angle that is equal to 180 degrees
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