Question

4. A closed cylindrical tank of radius 7 cm and height 3 m is made from a sheet of steel. How
much sheet of metal is needed?
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Answer 1

Answer:

Radius formula is( 2π r)

Height formula is( l * b

Answer 2

Answer:

given ,

radius of the tank = 7 cm (units are important)

height of the tank = 3 m

required amount of steel = ?

We need to find the total surface area of a cylinder

=2πr(r+h)

i. e = 2 ×22 / 7 × 7 (7+3) = 440 sq meter

that will be 440 sq meter

So, 440 sq m sheet of metal is required.

NOTE : UNITS ARE MUCH IMPORTANT...