In the follwing figure PQRS is a rhombus formed by joining the mid-points of a quadrilateral YMXN show that 3PQ2=SN2+NR2+QX2+XR2+PY2+YS2
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Given that, PQRS is a rhombus formed by joining mid-points of the sides of the quadrilateral YMXR ∴ YMXR is a rectangle ⇒∠Y=∠M=∠X=∠R=90∘ In triangle SNR,SN2+NR2=SR2 In triangle QXR,QX2+XR2=QR2 In triangle PYS,PY2+YS2=PS2 Since PQRS is a rhombus, PQ=RQ=RS=SP SR2+QR2+PS2=3PQ2 ⇒3PQ2=SN2+NR2+QX2+XR2+PY2+YS2
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