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The volume of a cylinder varies jointly with the square of its radius and with its height: [tex]V = k r^2 h[/tex].

Cylinder A has a volume of 254.34 cubic inches with a radius of 3 inches and a height of 9 inches.

What is the volume of cylinder B, which has a radius of 4 inches and a height of 5 inches?

A. 188.4 cubic inches
B. 62.8 cubic inches
C. 251.2 cubic inches
D. 3.14 cubic inches

Answer :

To solve this question, we need to find the volume of cylinder B using the relationship provided for the volume of a cylinder, which varies jointly with the square of its radius and its height. The formula given is:

[tex]\[ V = k \cdot r^2 \cdot h \][/tex]

1. Determine the constant [tex]\( k \)[/tex] using Cylinder A:
- Cylinder A has a volume ([tex]\( V \)[/tex]) of 254.34 cubic inches, a radius ([tex]\( r \)[/tex]) of 3 inches, and a height ([tex]\( h \)[/tex]) of 9 inches.
- Substitute these values into the formula to solve for [tex]\( k \)[/tex]:

[tex]\[ 254.34 = k \cdot 3^2 \cdot 9 \][/tex]

[tex]\[ 254.34 = k \cdot 9 \cdot 9 \][/tex]

[tex]\[ 254.34 = k \cdot 81 \][/tex]

- Divide both sides by 81 to find [tex]\( k \)[/tex]:

[tex]\[ k = \frac{254.34}{81} \][/tex]

2. Calculate the volume of Cylinder B:
- Cylinder B has a radius ([tex]\( r \)[/tex]) of 4 inches and a height ([tex]\( h \)[/tex]) of 5 inches.
- Use the same formula to calculate the volume ([tex]\( V \)[/tex]) for Cylinder B:

[tex]\[ V = k \cdot 4^2 \cdot 5 \][/tex]

[tex]\[ V = k \cdot 16 \cdot 5 \][/tex]

[tex]\[ V = k \cdot 80 \][/tex]

3. Substitute the value of [tex]\( k \)[/tex] from the first step into the formula for Cylinder B:

- Given that [tex]\( k \approx 3.14 \)[/tex] from our earlier calculation:

[tex]\[ V = 3.14 \cdot 80 \][/tex]

[tex]\[ V \approx 251.2 \][/tex]

The volume of cylinder B is approximately 251.2 cubic inches. This matches the given choice of 251.2 cubic inches.

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Rewritten by : Jeany