The sides of a triangle are 25 cm, 17 cm, and 12cm, .The length of the altitude on the longest side is ?

 Area of triangle = 

  s =  =  = 27

  area = 

  = 

  = 

  = 3*3*2*5

   = 90 cm²

Area if altitude is drawn on longest side = *b*h

  90 = *25*h

  h = 

  = 

  = 9.2 cm

So, length of altitude drawn on longest side = 9.2 cm