mathmari
Gold Member
MHB
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Hey! 
Which region does the set $D=\{(x, y, z) \mid \sqrt{x^2+y^2}\leq z\leq 1\}$ represent?
The surface $z= \sqrt{x^2+y^2}$ is a cone, or not? But why when we want to calculate an integral over $D$ we use cylindrical coordinates? (Wondering)

Which region does the set $D=\{(x, y, z) \mid \sqrt{x^2+y^2}\leq z\leq 1\}$ represent?
The surface $z= \sqrt{x^2+y^2}$ is a cone, or not? But why when we want to calculate an integral over $D$ we use cylindrical coordinates? (Wondering)