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Volume of hemisphere = ∫ ∫ ∫ r^{2} sinθ dr dθ dφ
i thing (r < r < (r + R)cosθ ) ( 0 < θ < 60 = π/6) and ( 0 < φ < 2π)
integral = 2π ∫ ⅓r^{3} sin θ dθ
= 2π ∫ ⅓ [((r+R)cosθ)^{3}  r^{3}] sin θ dθ
i don't know how to find volume of hemispere
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