Question

a closed cylindrical tank of radius 7m and height 3m is made from a sheet of metal. How much sheet of metal is required ​

Answer 1

$\boxed{\boxed{\mathbf{440 m^2}}}$

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step-by-step explaination:-

$\underline\text{We know that}$,

Area of Closed Cylinder = Curved Surface Area of Cylinder + 2(Area of Circle)

• => $\mathsf{2 \pi r h + 2(\pi r^2)}$

• => $\mathsf{2 \pi r (r + h)}$

$\textsf{Area of Closed Cylinder =}$ $\mathsf{2 \pi r h(r + h)}$

$\underline\text{Here}$,

• $\mathsf{\pi = \frac{22}{7}}$

• $\mathsf{Radius = 7m}$

• $\mathsf{Height = 3m}$

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Substituting the values in the Formula, we get,

• $\mathsf{2 \times \frac{22}{7} \times 7 (7 + 3)}$

• $\mathsf{=> 2 \times 22 (10)}$

• $\mathsf{=> 44 \times 10}$

• => $\boxed{\mathbf{ 440 cm^2}}$

Answer 2

440m2 is the answer hope it helps you buddy