The origin of $\pi$ How was $\pi$ originally found?
Was it originally found using the ratio of the circumference to diameter of a circle of was it found using trigonometric functions?
I am trying to find a way to find the area of the circle without using $\pi$ at all but it seems impossible, or is it?
If i integrate the circle I get:
$$4\int_{0}^{1}\sqrt{1-x^{2}}dx=4\left [ \frac{\sin^{-1} x}{2}+\frac{x\sqrt{1-x^{2}}}{2} \right ]_{0}^{1}=\pi $$
But why does $\sin^{-1} 1=\frac{\pi }{2}$?
Is it at all possible to find the exact area of the circle without using $\pi$?

to answer at 
"Is it at all possible to find the exact area of the circle without using π?"
hello, $A=CR/2$ 
"How was π originally found?"
maybe Pythagore and euclide with a²+b²=c² found the area of squares.
Then Archimede found $3+10/71<pi<3+1/7$
