Question 43

ΔABC is similar to ΔPQR. If ratio of perimeters of ΔABC and ΔPQR is 3:7 and if PQ = 21 cm, then the length of AB (in cm) is?

Solution

For similar triangles, ratio of perimeters = ratio of corrosponding sides

PQ/AB = 7/3

21/AB = 7/3

AB = 9

So the answer is option C.

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