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Question

In the given figure, O is a point in the interior of a ABC, OD BC, OE AC and OF AB. Then, OA2+OB2+OC2OD2OE2OF2=AF2BD2CE2

A
True
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B
False
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Solution

The correct option is B False
Join OA, OB and OC.

Applying Pythagoras theorem in ΔAOF, we have,
OA2=OF2+AF2
Similarly, in ΔBOD, OB2=OD2+BD2
Similarly, in ΔCOE, OC2=OE2+EC2
Adding these equations,
OA2+OB2+OC2=OF2+AF2+OD2+BD2+OE2+EC2
OA2+OB2+OC2OD2OE2OF2=AF2+BD2+CE2

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