Question

The radius of the base of a right circular cylinder is 3 cm and height is 7 cm. Find
(i) curved surface area
(ii) total surface area
(iii) volume of the right circular cylinder. $\left(\mathrm{\pi }=\begin{array}{c}22\\ 7\end{array}\right)$

Answer 1

Given:
Radius of the base of the right circular cylinder (r) = 3 cm
Height (h) = 7 cm
(i) Curved surface area of the cylinder = 2$\mathrm{\pi }$rh
= 2 × $\frac{22}{7}$ × 3 × 7
= 132 cm²

(ii) Total surface area of the cylinder = 2$\mathrm{\pi }$r(h + r)
= 2 × $\frac{22}{7}$ × 3 × (7 + 3)
= 188.6 cm²

(iii) Volume of the cylinder = $\mathrm{\pi }$r²h
= $\frac{22}{7}$ × 3² × 7
= 198 cm³