Question : The perimeters of two similar triangles $\triangle$ABC and $\triangle$PQR are 36 cm and 24 cm respectively. If PQ = 10 cm, then AB is:
Option 1: 15 cm
Option 2: 12 cm
Option 3: 14 cm
Option 4: 26 cm
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Correct Answer: 15 cm
Solution : $\triangle$ABC ~ $\triangle$PQR Perimeter($\triangle$ABC) = 36 cm Perimeter($\triangle$PQR) = 24 cm PQ = 10 cm $\frac{AB}{PQ}$ = $\frac{\text{Perimeter($\triangle$ABC)}}{\text{Perimeter($\triangle$PQR)}}$ ⇒ $\frac{AB}{10}$ = $\frac{36}{24}$ ⇒ AB = $\frac{360}{24}$ = 15 cm Hence, the correct answer is 15 cm.
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