Q : 7    The inner diameter of a circular well is \small 3.5\hspace{1mm}m. It is \small 10\hspace{1mm}m deep. Find

            (i) its inner curved surface area.

Answers (1)
N Nehul

Given,

The inner diameter of the circular well =  d = \small 3.5\hspace{1mm}m

Depth of the well = h = 10\ m

We know,

The curved surface area of a cylinder = 2\pi rh

\therefore The curved surface area of the well = 2\times\frac{22}{7}\times\frac{3.5}{2}\times10

\\ = 44 \times 0.25 \times 10 \\ = 110\ m^2

Therefore, the inner curved surface area of the circular well is 110\ m^2

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