2 / x \ _________ r *asin|---| / 2 2 \|r|/ x*\/ r - x ------------ + -------------- 2 2
0.5*x*(r^2 - x^2)^0.5 + 0.5*r^2*asin(x/|r|)
_________ / 2 2 2 / x \ x*\/ r - x + r *asin|---| \|r|/ ----------------------------- 2
_________ / 2 2 2 / x \ x*\/ r - x + r *asin|---| \|r|/ ----------------------------- 2