Please solve the 9th question.
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Q.9.  In the following figure, OP, OQ and OR are drawn perpendiculars to the sides BC, CA and AB respectively of triangle ABC. Prove that :
A P 2 + B P 2 + C Q 2 = A Q 2 + C P 2 + B R 2

AP square will be AR square. So here is answer. 

Here we will use pythagorus theorem 


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