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| Theorem 2 (Converse of Theorem 1) |
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| If two adjacent angles are supplementary, then their exterior arms lie in a straight line. |
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 are adjacent angles. |
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| AOB is a straight line. |
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| A Corollary is an easy consequence of a theorem. |
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| It two lines intersect, then the vertically opposite angles so formed are equal, |
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| When a number of lines meet at a point, the sum of the angles so formed is four right angles. |
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