If P,Q and R are foot of perpendiculars drawn from point A(1,1,1) to p – InterviewSolution

1.	If P,Q and R are foot of perpendiculars drawn from point A(1,1,1) to planes P1:x+2y+2z=2, P2:2x−2y+z=−8 and to line of intersection of P1 and P2 respectively, then area of ΔPQR is -
Answer» If $P, Q$ and $R$ are foot of perpendiculars drawn from point $A (1, 1, 1)$ to planes $P_{1} : x + 2 y + 2 z = 2$ , $P_{2} : 2 x - 2 y + z = - 8$ and to line of intersection of $P_{1}$ and $P_{2}$ respectively, then area of $Δ P Q R$ is -

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