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 bit + curved cone area

= $\pi$$(5{)}^2$ + 2$\pi$(5)(20) + $\pi$(5) ($\sqrt{89})$

= 855.05 $c{m}^2$