A cylinder is inscribed in a right circular cone of height 5.5 and radius (at the base) equal to 4.5. What are the dimensions of such a cylinder which has maximum volume?

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Lanuel

The dimensions of a cylinder which has this maximum volume are equal to 1.83 units and 3 units.

Given the following data:

  • Height of cylinder, h = 5.5 units.
  • Radius of cylinder, r = 4.5 units.

How to calculate the volume of this cylinder?

Mathematically, the volume of a cylinder can be calculated by using this formula:

V = πr²h

Next, we would convert the above multi-variable function into a single-variable function by applying the properties of 2 similar triangles:

H/H - h = R/r

H - h = r(H/R)

h = H/R(R - r)

V = πHr²/R(R - r)

In order to maximize the volume of this cylinder, we would determine the critical points of the function by differentiating wrt r:

dV/dr = πH/R(2rR - 2r² - r²)

(2rR - 3r²) = 0

r = 2R/3

r = (2 × 4.5)/3

Maximum radius, r = 3 units.

For the max. height, we have:

h = H/R(R - r)

h = H/R(R - 2R/3)

h = H/3

h = 5.5/3

Maximum height, h = 1.83 units.

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