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Sagot :
Let's consider the problem of finding the height of a right pyramid with a square base, given the volume and the length of the base edge.
### Step-by-Step Solution:
1. Volume Formula for a Pyramid:
The volume [tex]\( V \)[/tex] of a right pyramid with a square base is given by:
[tex]\[ V = \frac{1}{3} \times \text{base\_area} \times \text{height} \][/tex]
2. Area of the Square Base:
Since the base is a square with edge length [tex]\( y \)[/tex], the area of the base ([tex]\(\text{base\_area}\)[/tex]) is:
[tex]\[ \text{base\_area} = y^2 \][/tex]
3. Substitute Base Area into Volume Formula:
Substitute [tex]\( y^2 \)[/tex] for the base area in the volume formula:
[tex]\[ V = \frac{1}{3} \times y^2 \times \text{height} \][/tex]
4. Solve for Height:
We need to solve for the height ([tex]\(\text{height}\)[/tex]). Rearrange the equation to isolate height on one side:
[tex]\[ \text{height} = \frac{3V}{y^2} \][/tex]
Thus, the expression that represents the height of the pyramid is:
[tex]\[ \boxed{\frac{3V}{y^2}} \][/tex]
So, among the given choices, the correct option is:
[tex]\[ \frac{3 V}{y^2} \text{ units} \][/tex]
### Step-by-Step Solution:
1. Volume Formula for a Pyramid:
The volume [tex]\( V \)[/tex] of a right pyramid with a square base is given by:
[tex]\[ V = \frac{1}{3} \times \text{base\_area} \times \text{height} \][/tex]
2. Area of the Square Base:
Since the base is a square with edge length [tex]\( y \)[/tex], the area of the base ([tex]\(\text{base\_area}\)[/tex]) is:
[tex]\[ \text{base\_area} = y^2 \][/tex]
3. Substitute Base Area into Volume Formula:
Substitute [tex]\( y^2 \)[/tex] for the base area in the volume formula:
[tex]\[ V = \frac{1}{3} \times y^2 \times \text{height} \][/tex]
4. Solve for Height:
We need to solve for the height ([tex]\(\text{height}\)[/tex]). Rearrange the equation to isolate height on one side:
[tex]\[ \text{height} = \frac{3V}{y^2} \][/tex]
Thus, the expression that represents the height of the pyramid is:
[tex]\[ \boxed{\frac{3V}{y^2}} \][/tex]
So, among the given choices, the correct option is:
[tex]\[ \frac{3 V}{y^2} \text{ units} \][/tex]
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