Spherical sector calculator
* Input 2 values and r_{1}



h = R(1  cosθ)
In the above case we had a sector with γ = 0 and r_{1} = 0
Sector surface area of the spherical section is:
Surface area of the outer cone: S_{2} = πRr_{2}
Surface area of the inner cone: S_{1} = πRr_{1}
Total sector area: S_{sector} = S_{sec} + S_{1} + S_{2} = πR(2h + r_{1} + r_{2})
