In: Math
Find the volume of the solid in R^3 above the plane z = 0 and below the surface z = 4 − x^2 − y^2.
The given surface is,

put z = 0,



Hence the given region D is the circle with radius 2 in XY plane,
The volume of the solid is given by,

using polar coordinates as follows,




Now the integral in polar becomes,


integrate wrt r,



integrate wrt theta,

