The surface area of the cuboid is 758cm2. Its length and breadth are 14cm and 11cm respectively. Find the height.Class: 10

# The surface area of the cuboid is 758cm2. Its length and breadth are 14cm and 11cm respectively. Find the height.Class: 10

1. A
5 cm
2. B
8cm
3. C
9 cm
4. D
2 cm

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### Solution:

Given
l = 14cm
b = 11cm
h = ?
Let h = h
Surface area of cuboid = 758cm2
∴ Surface area of cuboid = 2(lb + bh + hl)
758 = 2(14 × 11 + 11 × h + h × 14)
758 = 2 (154 + 11h + 14h)
758 = 2(154 + 25h)
758 = 308 + 50h
758 – 308 = 50h
h = 9cm

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