Question

The perimeter of a ∆ is 30cm if its sides are in the ratio 1:3:2, then it's greatest side is-----------------------------

Answer 1

Add the 3 ratios together: 1 + 3 + 2 = 6

Divide perimeter by total:

30/6 = 5

Multiply each ratio by 5:

1 x 5 = 5

3 x 5 = 15

2 x 5 = 10

The greatest side is 15 cm