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Theorem 7.3 : The sides opposite to equa...

Theorem 7.3 : The sides opposite to equal angles of a triangle are equal.

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In `/_\BAD` and `/_\CAD`
`/_B=/_C` (given)
`/_BAD=/_CAD`
`AD=AD` (common)
By AAS congruence rule, `/_\BAD`and `/_\CAD` are congruent. Thus,
`AB=AC`
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