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Question 73
The area of a circle is 1386 $$cm^{2}$$. What is the radius of the circle? [Use $$\pi = \frac{22}{7}$$]
Solution
$$63\times7\ =\left(radius\right)^2$$
$$7\times\ 9\times7\ =\left(radius\right)^2$$
$$7^2\times\ 3^2\ =\left(radius\right)^2$$
$$radius = 7\times3$$
Radius of the circle =Â 21 cm
The area of a circle is 1386 $$cm^{2}$$.
area of a circle =Â $$\pi\ \times\left(radius\right)^2$$
$$1386=\frac{22}{7}\ \times\left(radius\right)^2$$
$$63=\frac{1}{7}\ \times\left(radius\right)^2$$$$63\times7\ =\left(radius\right)^2$$
$$7\times\ 9\times7\ =\left(radius\right)^2$$
$$7^2\times\ 3^2\ =\left(radius\right)^2$$
$$radius = 7\times3$$
Radius of the circle =Â 21 cm
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