area

x2+y2-4≤0

gives the area inside the radius 2!

Second one is the graph of sin curve..

Drwa the curves.. you will get the answer :)

I know it is not as simple as i have put it..

And yeah is the answer 2Pi?

is that greatest integer!? ?

If not the answer is half the area of the circle..

if it is then it will be something else i guess! :)