if the ratio of side of a triangle are 3:4:5 what is the perimeter of the triangle is 90 cm?

Question

Use and algebraic equation to solve the problem.

Answer 1

Given P = 90cm

Perimeter of a triangle = a+b+c

Here given the ratio 3:4:5.

The sides are 3x,4x,5x.

3x+4x+5x = 90

12x = 90

12x/12 = 90/12

x = 7.5cm

First side of triangle = 3x = 3*7.5 = 22.5cm

Second side of triangle = 4x = 4*7.5 = 30 cm

Third side of triangle = 5x = 5*7.5 =37.5 cm