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I KNOW ALL OF U CAN PROVE-------
\[\pi = {360\times sin\frac{\theta }{2}}\]
here theta is infinitely small a radian angle.

fix your code. I tried to fix it for you, but I don't understand what you are tying to say.

farhan wrote:I KNOW ALL OF U CAN PROVE-------\[\pi = 360\times sin\frac {\theta }{2}
\]
here theta is infinitely small a radian angle.

I guess he said this.Then my answer is we can prove \[\pi=\lim_{n\to \infty}n\times sin\left ( \frac {180}{n}\right )\]

farhan wrote:I KNOW ALL OF U CAN PROVE-------
\[\pi = {360\times sin\frac{\theta }{2}}\]
here theta is infinitely small a radian angle.

That's clearly not true; the left hand side is a constant, and the right hand side is a non-constant function whose limit at zero is not the left hand side.