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

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Use and algebraic equation to solve the problem.

asked Dec 3, 2013 in ALGEBRA 2 by linda Scholar

1 Answer

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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

 

 

answered Dec 3, 2013 by william Mentor

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