ΔABC ~ ΔDEF such that AB = 9.1 cm and DE = 6.5 cm. If the perimeter of ΔDEF is 25 cm, what is the perimeter of ΔABC?
Since the 
ABC ∼ 
DEF
So the sides of the triangles are in the same ratio be k
= 
= 
= K………….1
= 
= K
K = 1.4
= K
= 1.4
= 1.4 × 25
= 35 cm
28