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Question 69
If the area of a circle is A, radius of the circle is r and circumference of it is C, then
Solution
Radius of circle is given $$r$$
Area of circle = $$A$$ = $$\pi*r^2$$
=> $$\pi r$$ = $$\frac{A}{r}$$
Circumference of circle = $$C$$ = $$2*\pi*r$$
=> $$\pi r$$ = $$\frac{C}{2}$$
Comparing both equations, we get :
=> $$\frac{A}{r} = \frac{C}{2}$$
=> $$rC = 2A$$
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