A cylindrical tin is open at the top. Its radius is $7$ cm and height is $10$ cm. Find the area of metal…
A cylindrical tin is open at the top. Its radius is $7$ cm and height is $10$ cm. Find the area of metal sheet used (CSA + one circular base). Use $\pi=\dfrac{22}{7}$.
$594 \text{ cm}^{2}$
$748 \text{ cm}^{2}$
$440 \text{ cm}^{2}$
$1188 \text{ cm}^{2}$
Solution
Required area $= 2\pi r h + \pi r^{2} = 2 \times \dfrac{22}{7} \times 7 \times 10 + \dfrac{22}{7} \times 49 = 440 + 154 = 594 \text{ cm}^{2}$.