Question 12 Marks
How many square metres of canvas is required for a conical tent whose height is 3.5m and the radius of the base is 12m?
Answer
View full question & answer→Area of canvas required $=\pi\text{rl}$
$\text{l}=\sqrt{\text{r}^2+\text{h}^2}=\sqrt{(3.5)^2+(12)^2}$
$=\sqrt{12.25+144}=\sqrt{156.25}=12.5\text{m}$
$\therefore$ Area of canvas required $=\pi\text{rl}=\frac{22}{7}\times12\text{m}\times12.5\text{m}=471.42\text{m}^2$
$\text{l}=\sqrt{\text{r}^2+\text{h}^2}=\sqrt{(3.5)^2+(12)^2}$
$=\sqrt{12.25+144}=\sqrt{156.25}=12.5\text{m}$
$\therefore$ Area of canvas required $=\pi\text{rl}=\frac{22}{7}\times12\text{m}\times12.5\text{m}=471.42\text{m}^2$