the dimensionsn of cuboid are in the ratio 5:3:2. its volume is 21870 cub cm. Find its total surface area.

• taking multiple proportion of the ratio so dimensions are 5x 3x 2x
  volume=l*b*h
  21870=5x*3x*2x
  21870=30x3
  x3=729
  x=9
  l=5*9=45 , b=3*9=27, h=2*9=18
  Surface Area=2(lb+bh+hl)
  Surface Area=2(45*27+27*18+18*45)
  Surface Area=2*2511
  Surface Area=5022cm2
• 11 years agoHelpfull: Yes(1) No(0)
• volume = l*b*h=30x^3=21870=>x=9
  s.a=2(lb+bh+hl)=2(72+45+63)=360sq cm
• 11 years agoHelpfull: Yes(0) No(1)