Sphere and cone

Within the sphere of radius G = 33 cm inscribe the cone with the largest volume. What is that volume, and what are the dimensions of the cone?

Correct answer:

r =  31.11 cm
h =  44 cm
V =  44602.24 cm³

Step-by-step explanation:

$$\begin{gathered} G=33cm \\ V={\displaystyle \frac{1}{3}}\pi r^{2}h \\ h=G+x=33+x \\ {G}^2=x^2+r^2 \\ {r}^2=G^2-x^2 \\ V={\displaystyle \frac{1}{3}}\pi (G^2-x^2)(G+x) \\ V={\displaystyle \frac{1}{3}}\pi (G^3+G^{2}x-G{x}^2-x^3) \\ {V}^{\mathrm{\prime }}={\displaystyle \frac{1}{3}}\pi (G^2-2Gx-3x^2) \\ {V}^{\mathrm{\prime }}=0 \\ {G}^2-2Gx-3x^2=0 \\ -3x^2-66x+1089=0 \\ 3x^2+66x-1089=0 \\ a=3;b=66;c=-1089 \\ D=b^2-4ac=66^2-4\cdot 3\cdot (-1089)=17424 \\ D>0 \\ {x}_{1,2}={\displaystyle \frac{-b\pm \sqrt{D}}{2a}}={\displaystyle \frac{-66\pm \sqrt{17424}}{6}} \\ {x}_{1,2}={\displaystyle \frac{-66\pm 132}{6}} \\ {x}_{1,2}=-11\pm 22 \\ {x}_1=11 \\ {x}_2=-33 \\ \text{ Factored form of the equation: } \\ 3(x-11)(x+33)=0 \\ h=G+x_1=33+11=44cm \\ r=\sqrt{G^2-x_1^2}=31.11\text{ cm } \end{gathered}$$

$h=33+11=44\text{ cm}$

$V={\displaystyle \frac{1}{3}}\pi r^{2}h=44602.24{\text{cm}}^3$

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Showing 1 comment:

Dr Math

that's very mind blowing

2 years ago  Like

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