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Short Note

The surface area of a cuboid is 1300 cm^{2}. If its breadth is 10 cm and height is 20 cm^{2}, find its length.

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#### Solution

Let, *l* → Length of the cuboid

Breadth of the cuboid (*b*) = 10 cm

Height of the cuboid (*h*) = 20 cm

Surface area of the cuboid (*A*) = 1300 cm^{2}

We have to find the length of the cuboid

We know that,

A = 2 (lb + bh + hl)

1300 = 2(10l + 10 × 20 + 20l)

1300 = 2 (200 + 30l)

1300 = 400 + 60l

l =`(1300-400)/60`

`=900/60`

= 15 cm

Length of the cuboid is 15 cm .

Concept: Surface Area of a Cuboid

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