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10 Cards in this Set
- Front
- Back
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if 2 parallel planes are cut by a third plane...
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the lines of intersection are parallel
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if 2 PARALLEL lines are cut by a transversal, then corresponding angles are
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congruent.
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assuming that the corr. angle postulate is valid, we can prove that parallel lines cut by a transversal and make alternate int/SSI angles are
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congruent.
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if a transversal is perpendicular to one of two parallel lines, then it's perpendicular to
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the other one, too.
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in a plane, 2 lines perp. to the same line are
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parallel!
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through a point outside a line, there's ______ line parallel to the given line
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EXACTLY one
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through a point outside a line, there's exactly one line ________
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to the given line
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2 lines parallel to a third line are
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parallel to each other
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ways to prove 2 lines parallel
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- show that corr. congrunet
- alt. ints -SSIs -both lines perp. to a third - both lines parallel to a third |
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the measure of an exterior angle of a triangle equals
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the sum of the two remote interior angles
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