Question

Side of triangle are in ratio 3:2:5 and perimeter is 30 cm what is the longest side

Answer 1

let the sides be... 3x, 2x, 5x

perimeter is 30 then,

3x+2x+5x=30

>10x=30

>x=3

longest side is 5x...

5x =5×3cm

=15cm

hope it helps

Answer 2

Step-by-step explanation:

$3x + 2x + 5x = 30 \\ 10x = 30 \\ x = 30 \div 10 \\ x = 3 \\ we \: know \: that \: \\ 3 \times 3 = 9 \\ 2 \times 3 = 6 \\ 5 \times 3 = 15 \\ then \\ therefore \: \: the \: longest \: side \: is \: 5$