Question

Find the Surface Area(in $c{m}^2$) of :

• A. 900
• B. 855.05
• C. 820.75
• D. 830.75

Answer 1

The correct option is B

855.05

Surface area = base circle + curved cylindrical part + curved cone area

$=\pi r^2+2\pi rh+\pi rl$

$=\pi (5{)}^2+2\pi (5\left)\right(20)+\pi (5\left)\right(11)$

$=\pi \times 5(5+40+11)$

$=\frac{22}{7}\times 5\times 56$

$=880c{m}^2$