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प्रश्न
The surface area of a cuboid is 1300 cm2. If its breadth is 10 cm and height is 20 cm2, find its length.
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उत्तर
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 cm2
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 .
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