A cone has radius 7 cm and slant height 15 cm. Find the total exposed surface area, using \(\pi=3.14

Question

A cone has radius 7 cm and slant height 15 cm. Find the total exposed surface area, using $\pi=3.142$ where needed. Give decimal answers to 2 d.p. $l=15\text{ cm}$ $r=7\text{ cm}$ Central section

Accepted Answer

Total area $=\pi r^2+\pi rl=\pi(7^2)+\pi(7)(15)=154\pi=483.87\text{ cm}^2$.

Exposed surface area

Exposed surface area

Solution:

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