Question

The perimeters of two similar triangle ABC and PQR are 60cm and 36cm respectively. If PQ = 9cm, then AB equals :

A ) 6cm B) 10cm C) 15cm D) 24cm

Answer 1

Perimeter of tri ABC =AB
----------------------------- ----
Perimeter of tri PQR = PQ
36 =AB
--- ----
24 10
AB=36 10
----- *
24
=15units
Hence AB is 15unit


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Answer 2

given:
perimeter of triangle ABC =60cm
and that of triangle PQR=36cm
so,now in triangle ABC and triangle PQR :
60/36=AB/9
AB=15cm