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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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