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3-1: If two parallel planes... |
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...are cut by a third plane, then the lines of intersection are parallel |
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post. 10: If two parallel lines are cut by a transversal, then corresponding... |
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3-2: If 2 parallel lines are cut by a transversal, then alternate... |
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...interior angles are congruent |
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3-3: If 2 paallel lines are cut by a transversal, the same side... |
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...interior angles are supplementary |
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3-4: If a transversal is perpendicular... |
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...to one of 2 parallel lines, then it is perpendicular to the other one also. |
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3-5:If two lines are cut by a transversal and alternate... |
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...interior angles are congruent, then the lines are paralllel. |
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3-6: If 2 lines are cut by a transversal and same-side... |
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...interior angles are supplementary, then the lines are parallel |
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...two lines perpendicular to the smae line are parallel |
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3-8: through a pointe outside a line, ther is exactly one line parallel... |
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3-9: Through a point outside a line, there is exactly one line perpendicular... |
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...parallel to a third line are parallel to eachother |
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