Given ∆ABC, lines are drawn through A, B and C parallel respectively to thesides BC, CA and AB, forming ∆PQR (Fig. 13.27). Show that BC=12QR

Given $∆$ ABC, lines are drawn through A, B and C parallel respectively to the
sides BC, CA and AB, forming $∆$ PQR (Fig. 13.27). Show that $B C = \frac{1}{2} Q R$

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