Question

The height of a cylinder is 80 cm and the diameter of its base 7 cm.The whole surface area of the cylinder is

(a) $1837c{m}^2$

(b) $1760c{m}^2$

(c) $1942c{m}^2$

(d) $3080c{m}^2$

Answer 1

Diameter of cylinder=7cm

$\therefore Radius\left(r\right)=\frac{7}{2}cm$

Height (h)=80 cm

$\therefore Totalsurfacearea=2\pi r(h+r)$

$=2\times \frac{22}{7}\times \frac{7}{2}(80+\frac{7}{2})c{m}^2$

$=22\left(\frac{167}{2}\right)=1837c{m}^3$