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1
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interior angles that lie on opposite sides of the transversal.
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2
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lines that intersect at right angles.
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3
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lie inside the parallel lines.
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4
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lie outside the parallel lines.
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5
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a line that intersects two or more other lines.
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6
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angles that are in the same position on the two lines in relation to the transversal.
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7
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two lines in a plane that never intersect or cross.
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