SOLUTION: Please help me. The perimeter of a triangle is 90 cm The lengths of the sides of the triangle are in the ratios 3 : 5 : 7 Work out the length of the longest side of the

Algebra ->  Triangles -> SOLUTION: Please help me. The perimeter of a triangle is 90 cm The lengths of the sides of the triangle are in the ratios 3 : 5 : 7 Work out the length of the longest side of the      Log On


   

Question 635240: Please help me. The perimeter of a triangle is 90 cm

The lengths of the sides of the triangle
are in the ratios 3 : 5 : 7

Work out the length of the longest side
of the triangle.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

The perimeter of a triangle is 90 cm

The lengths of the sides of the triangle are in the ratios 3 : 5 : 7 

 3k + 5k + 7k = 90cm     | Letting k be the constant of the proportion

         15k = 90cm

           k = 6cm

 7%2A6cm+=+42cm, the longest side

and...

 18+%2B+30+%2B+42+=+90