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If ∆ABC~∆QRP, ar(∆ABC) ar(∆QRP) = 9/4 , AB = 18 cm and BC = 15 cm, then PR = ? 

(a) 18 cm 

(b) 10 cm 

(c) 12 cm 

(d) 20/3 cm

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Best answer

(b) 10 cm 

∵ ∆ABC ~ ∆QRP

Hence, 3PR = 2BC = 2 × 15 = 30 

PR = 10 cm

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