Question

A box is 42 cm long 39 cm wind . Find its height if its total surface area is 7812 cm square.

Answer 1

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Answer 2

TSA of cuboid =2(lb+bh+hl)

since length is 42cm

breadth is 39cm

let , height be h cm

and TSA of cuboid is given as 7812cm square

2[(42*39)+(39*h)+(h*42)] = 7812

2(1638+39h+42h)=7812

1638+81h=3906

81h=2268

h=28