\(\triangle ABC \sim \triangle DEF\), \(A(\triangle ABC) = 81\) cm², \(A(\triangle DEF) = 121\) cm² and \(EF = 6.6\) cm. Then \(BC = \)

A. 7.2 cm

B. 8.07 cm

C. 5.4 cm

D. 4.9 cm

Doubtly AI Asked 24 Oct 2026 AI-verified · Oct 2026 ssc 10th Save WhatsApp Report

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Best answer

Answer: C. 5.4 cm

\(\frac{81}{121} = \frac{BC^2}{EF^2} \Rightarrow \frac{BC}{EF} = \frac{9}{11} \Rightarrow BC = \frac{9}{11} \times 6.6 = 5.4\) cm.

Doubtly AI · 24 Oct 2026 AI-verified · Oct 2026 Report

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