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Question 74
The volume of a cone is 27720 $$cm^{3}$$. If the height of the cone is 20 cm, then what will be the area of the base?
Solution
$$1386\times\ 3=\pi\times\left(radius\right)^2$$
$$4158=\pi\times\left(radius\right)^2$$
Area of the base of a cone =Â $$\pi\times\left(radius\right)^2\ =\ 4158$$Â $$cm^{2}$$
The volume of a cone is 27720 $$cm^{3}$$.
volume of a cone =Â $$\frac{1}{3}\times\pi\times\left(radius\right)^2\ \times height$$
$$27720 =Â \frac{1}{3}\times\pi\times\left(radius\right)^2\ \times height$$
If the height of the cone is 20 cm.
$$27720=\frac{1}{3}\times\pi\times\left(radius\right)^2\ \times20$$
$$\frac{27720\times\ 3}{20}=\pi\times\left(radius\right)^2$$$$1386\times\ 3=\pi\times\left(radius\right)^2$$
$$4158=\pi\times\left(radius\right)^2$$
Area of the base of a cone =Â $$\pi\times\left(radius\right)^2\ =\ 4158$$Â $$cm^{2}$$
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