English

If ΔABC ~ ΔQRP, (ar(ΔABC))/(ar(ΔPQR)) = 9/4, AB = 18 cm and BC = 15 cm then PR = ?

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Question

If ΔABC ~ ΔQRP, `(ar(ΔABC))/(ar(ΔPQR)) = 9/4`, AB = 18 cm and BC = 15 cm then PR = ?

Options

  • 8 cm

  • 10 cm

  • 12 cm

  • `20/3` cm

MCQ
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Solution

10 cm

Explanation:

ar(ΔQRP) = ar(ΔPQR).

∴ `(ar(ΔABC))/(ar(ΔQRP)) = 9/4 = 3^2/2^2`

⇒ `(BC)/(RP) = 3/2`   ...[∵ ΔABC ∼ ΔQRP]

⇒ `PR = 2/3 xx BC`

= `2/3 xx 15 cm`

= 10 cm

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Chapter 7: Triangles - MULTIPLE-CHOICE QUESTIONS (MCQ) [Page 456]

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R.S. Aggarwal Mathematics [English] Class 10
Chapter 7 Triangles
MULTIPLE-CHOICE QUESTIONS (MCQ) | Q 47. | Page 456
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