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91Ó°ÊÓ

Let Rbe the radius of the base of a cone and hbe the height of the cone. Use cylindrical coordinates to set up and evaluate a triple integral proving that the volume of the cone is13Ï€R2.

Short Answer

Expert verified

This can be proved by taking an equation of cone that gives it a point at the origin that opens upward and downward.

Step by step solution

01

Given Information

It is given that Ris the radius of cone and his radius of cone.

02

Evaluate the limits

Let us assume equation a2z2=h2x2+h2y2and it gives it a point at the origin that opens upward and downward and h=z. It gives aas radius of circle.

≤θ≤2π,0≤r≤R,hR≤z≤h is the region bounded by curves.

03

Calculating Volume of cone

The required volume is given by

V=∫02π∫0R∫hrRhrdzdrdθ

V=∫02π∫0R(z)hrRhrdrdθ

role="math" localid="1652391977550" V=∫02π∫0Rh-hrRrdrdθ

V=∫02πh∫0Rrdr-hR∫0Rr2drdθ

Simplifying further

V=∫02πhR22-hRR33dθ

V=∫02πhR22-hR23dθ

V=∫02πhR26dθ

=hR26(θ)02π

V=hR26(2Ï€)

Hence, required volume isV=Ï€R2h3

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