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Question

ΔABC is an isosceles triangle in which AB=AC. Show that B=C.

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Solution

Wegivenanisoscelestriangle,ABCinwhichAB=AC.weneedtoprovethatB=CLetusdrawthebisectorofAandletDbethepointsofintersectionofthisbisectorofAandBC (SeeFig)Intriangle,AB=AC(given)BAD=CAD(byconstruction)AD=AD(common)ΔBADΔCAD(bySASneed)B=C(CPCT).

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