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Question

PM2+RN2=5MN2
183240_88d01e88b8ef4e35abec5abb26b39287.png

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Solution

In PQM
PM2=PQ2+QM2 ---(1)

In NQR
RN2=NQ2+QR2 ---(2)

Adding (1) and (2),
PM2+RN2=PQ2+QM2+NQ2+QR2PM2+RN2=4NQ2+4QM2+MN2 ......[2PQ=NQ,2QM=QR]
PM2+RN2=5MN2

Hence proved.

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