Question

The lengths of the sides of a triangle are in the ratio 5 : 6 : 7. What is the length of the longest side if the perimeter is less than 54 cm?

Answer 1

The longest side is less than 21 cm.

Explanation:

5`x` + 6`x` + 7`x` < 54

18`x` <54

divide both sides by 18

`x` < 3

so the sides would be less than 15, less than 18 and less than 21 cm