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Question

In ABC, (fig. 3.75) the perpendicular bisectors of side AB and AC intersect each other at point P. Show that the perpendicular bisector of CB also passes through point P.

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Solution

Construction : Draw a perpedicular bisector of CB, l3.Since l1 and l2 are perpendicular bisectors of AB and AC,PA =PB (perpendicular-bisector theorem)Also, PA= PC (perpendicular-bisector theorem)Thus, PA =PB = PCOr we can say that the perpendicular bisector of CB also passes through point P.Or, l passes through point P.Hence proved.


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