Question

10. A rectangular box is 85 cm long, 60 cm wide and 40 cm high. It is without
lid. Find the inner surface area of the box.
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Answer 1

Answer:

21800 cm³

Step-by-step explanation:

Inner Surface Area = 2(lh+lb+bh)

= 2(85*40 + 85*60 + 60*40)

= 2(3400+5100+2400)

= 2(10900)

= 21800 cm³

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Answer 2

Answer:

Step-by-step explanation:

Given that,

Length of the rectangular box=85 cm

Breadth of the box=60 cm

Height of the box=40 cm

The box is open at the top.

So, the inner surface area=lateral surface area + area of the base

= 2h(l+b)+lb

= [2×40(85+60)]+[85×60]

= [2×40×145]+[85×60]

= 16700cm²

Hope you got it