Question

A closed cylindrical tank of height 1.4 m. and radius of the base is 56 cm. is made up of a thick metal sheet. How much metal sheet is required (Express in square meters)

Answer 1

Radius = 56cm
= 56/100m
Height = 1.4m
Total surface area(TSA) = 2πr(r+h)
= 2×22/7×56/100(0.56+1.4)
= 2×22×8/100×1.96
= 44×8/100×196/100
= 68992/10000=6.8992m^2.

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Answer 2

Given the height of cylindrical tank =h=1.4 m

And Radius of cylindrical tank =56 cm =0.56 m

So the Metal sheet required to make cylindrical tank are = total surface area of cylindrical tank= 2πr(r+h)

$= 2× \frac{22}{7} \times 0.56(1.4+0.56)$

$= 2×22×0.08×1.96=6.8992 {m}^{2}$

Then metal sheet required = 6.9m²