A sphere and a cylinder have the same radius and height. The volume of the cylinder is [tex]$48 \, cm^3$[/tex].

What is the volume of the sphere?
[tex]\square \, cm^3[/tex]



Answer :

To solve this problem, follow these steps:

1. Identify the volume formulas:
- For a cylinder, the volume [tex]\( V_{\text{cylinder}} \)[/tex] is given by:
[tex]\[ V_{\text{cylinder}} = \pi r^2 h \][/tex]
- For a sphere, the volume [tex]\( V_{\text{sphere}} \)[/tex] is given by:
[tex]\[ V_{\text{sphere}} = \frac{4}{3} \pi r^3 \][/tex]

2. Given data:
- The volume of the cylinder is [tex]\( 48 \, \text{cm}^3 \)[/tex].
- The sphere and cylinder share the same radius [tex]\( r \)[/tex] and the height [tex]\( h \)[/tex] of the cylinder is equal to the diameter of the sphere, which is [tex]\( 2r \)[/tex].

3. Express the height of the cylinder:
- From the volume of the cylinder, we know:
[tex]\[ \pi r^2 h = 48 \][/tex]
- Substitute [tex]\( h = 2r \)[/tex] into the cylinder's volume formula:
[tex]\[ \pi r^2 (2r) = 48 \][/tex]
[tex]\[ 2 \pi r^3 = 48 \][/tex]

4. Solve for [tex]\( r^3 \)[/tex]:
- Isolate [tex]\( r^3 \)[/tex]:
[tex]\[ r^3 = \frac{48}{2 \pi} \][/tex]
[tex]\[ r^3 = \frac{48}{2 \pi} = \frac{24}{\pi} \][/tex]
[tex]\[ r^3 \approx 7.639437268410976 \][/tex]

5. Solve for [tex]\( r \)[/tex]:
[tex]\[ r = (r^3)^{1/3} \][/tex]
[tex]\[ r \approx (7.639437268410976)^{1/3} \approx 1.969490043685393 \, \text{cm} \][/tex]

6. Calculate the volume of the sphere:
- Using [tex]\( r \approx 1.969490043685393 \, \text{cm} \)[/tex]:
[tex]\[ V_{\text{sphere}} = \frac{4}{3} \pi r^3 \][/tex]
- Substitute [tex]\( r^3 \approx 7.639437268410976 \)[/tex]:
[tex]\[ V_{\text{sphere}} = \frac{4}{3} \pi \times 7.639437268410976 \][/tex]
[tex]\[ V_{\text{sphere}} \approx 31.999999999999993 \, \text{cm}^3 \][/tex]

So, the volume of the sphere is [tex]\( 32 \, \text{cm}^3 \)[/tex], bearing in mind that we approximated the result to the nearest integer.