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.

are adjacent angles.

AOB is a straight line.

A Corollary is an easy consequence of a theorem.

It two lines intersect, then the vertically opposite angles so formed are equal,

and

When a number of lines meet at a point, the sum of the angles so formed is four right angles.



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