Question

length,breach and height of cuboid are in the ratio 10:6:5 its totat suface area is 1120 sqcm. find total surface area of vertical surfaces​

Answer 1

let the common multiple be x.

l= 10x cm

b=6x cm

h=5x cm

total surface area=2(lb+bh+hl)

1120 =2×(10x×6x+6x×5x+5x×10x)

1120/2=60x+30x+50x

560=140x

x=560/140

x=4

l= 40cm

b=24cm

h=20cm

total surface area of vertical surface

=2h(l+b)

=2×20(40+24)

=40×64

=256sq.cm

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