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A cylinder-shaped candle has a diameter of 5 inches and a height of 8 inches.

What is the volume of the cylinder? Use 3.14 for pi. Round to the nearest tenth, if necessary.

A. 62.8 in³
B. 125.6 in³
C. 157 in³
D. 628 in³

Answer :

To find the volume of a cylinder-shaped candle with a diameter of 5 inches and a height of 8 inches, we can use the formula for the volume of a cylinder:

[tex]\[ V = \pi r^2 h \][/tex]

where:
- [tex]\( V \)[/tex] is the volume,
- [tex]\( r \)[/tex] is the radius of the cylinder's base,
- [tex]\( h \)[/tex] is the height, and
- [tex]\( \pi \)[/tex] (pi) is approximately 3.14.

Step 1: Find the radius.
Since the diameter of the cylinder is 5 inches, the radius [tex]\( r \)[/tex] is half of the diameter:
[tex]\[ r = \frac{\text{diameter}}{2} = \frac{5}{2} = 2.5 \text{ inches} \][/tex]

Step 2: Use the formula to calculate the volume.
Now that we have the radius and the height, we can substitute these values into the formula:
[tex]\[ V = \pi \times r^2 \times h \][/tex]
[tex]\[ V = 3.14 \times (2.5)^2 \times 8 \][/tex]

Step 3: Calculate [tex]\( r^2 \)[/tex].
[tex]\[ r^2 = (2.5)^2 = 6.25 \][/tex]

Step 4: Substitute [tex]\( r^2 \)[/tex] into the formula and compute the volume.
[tex]\[ V = 3.14 \times 6.25 \times 8 \][/tex]
[tex]\[ V = 3.14 \times 50 \][/tex]
[tex]\[ V = 157 \text{ cubic inches} \][/tex]

Therefore, the volume of the cylinder is 157 cubic inches. The correct answer is [tex]\(157 \, \text{in}^3\)[/tex].

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Rewritten by : Jeany