Question

A closed cylindrical tank of radius 1.50m and height 300cm, is made from a metal sheet. How much sheet is required?

Answer 1

Answer: 13.5π≈42.41

Step-by-step explanation:

Basically it is asking for the circumference of this cylinder.

#1 Find the circumference of the circle base

Formula to use: 2πr

2πr=2π(1.5)=3π

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#2 Find the area of the circle base

Formula to use: πr²

πr²=π(1.5)²=2.25π

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#3 Find the area of body of the cylinder

Formula to use: lw

300cm=3m

l (length)= 3π (since the body of the cylinder the basing on the circumference of the circle base)

w (width)= 3

lw=3π×3m=9π

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#4 Add all of them together

There are 2 base and one body

2.25π×2+9π=13.5π