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A horticulturist is planning a garden that is [tex]4 \, m \times 20 \, m[/tex]. Which dimensions could she use to create a scale model to plan it?

A. [tex]40 \, cm \times 200 \, cm[/tex]
B. [tex]1 \, cm \times 5 \, m[/tex]
C. [tex]4 \, m \times 2 \, m[/tex]
D. [tex]1 \, m \times 4 \, m[/tex]

Sagot :

To determine which dimensions could be used to create a scale model of the garden that measures [tex]\(4 \, \text{m} \times 20 \, \text{m}\)[/tex], we need to check if the given options maintain the same scale ratio as the original garden.

Let's examine each option:

### Original Garden Dimensions:
- Length: [tex]\( 20 \, \text{m} \)[/tex]
- Width: [tex]\( 4 \, \text{m} \)[/tex]

### Option A: [tex]\( 40 \, \text{cm} \times 200 \, \text{cm} \)[/tex]
First, convert the given dimensions from centimeters to meters:
- Length: [tex]\( 200 \, \text{cm} = 2.0 \, \text{m} \)[/tex]
- Width: [tex]\( 40 \, \text{cm} = 0.4 \, \text{m} \)[/tex]

Now calculate the ratios:
- Length ratio: [tex]\( \frac{2.0 \, \text{m}}{20 \, \text{m}} = 0.1 \)[/tex]
- Width ratio: [tex]\( \frac{0.4 \, \text{m}}{4 \, \text{m}} = 0.1 \)[/tex]

Since both ratios are equal, the dimensions (40 cm × 200 cm) maintain the same scale as the original garden.

### Option B: [tex]\( 1 \, \text{cm} \times 5 \, \text{m} \)[/tex]
First, convert the dimensions if necessary:
- Width: [tex]\( 1 \, \text{cm} = 0.01 \, \text{m} \)[/tex]
- Length is already in meters: [tex]\( 5 \, \text{m} \)[/tex]

Now calculate the ratios:
- Length ratio: [tex]\( \frac{5 \, \text{m}}{20 \, \text{m}} = 0.25 \)[/tex]
- Width ratio: [tex]\( \frac{0.01 \, \text{m}}{4 \, \text{m}} = 0.0025 \)[/tex]

The ratios are not equal, so these dimensions do not maintain the same scale as the original garden.

### Option C: [tex]\( 2 \, \text{m} \times 4 \, \text{m} \)[/tex]
- Length: [tex]\( 2 \, \text{m} \)[/tex]
- Width: [tex]\( 4 \, \text{m} \)[/tex]

Now calculate the ratios:
- Length ratio: [tex]\( \frac{2 \, \text{m}}{20 \, \text{m}} = 0.1 \)[/tex]
- Width ratio: [tex]\( \frac{4 \, \text{m}}{4 \, \text{m}} = 1.0 \)[/tex]

The ratios are not equal, so these dimensions do not maintain the same scale as the original garden.

### Option D: [tex]\( 1 \, \text{m} \times 4 \, \text{m} \)[/tex]
- Length: [tex]\( 4 \, \text{m} \)[/tex]
- Width: [tex]\( 1 \, \text{m} \)[/tex]

Now calculate the ratios:
- Length ratio: [tex]\( \frac{4 \, \text{m}}{20 \, \text{m}} = 0.2 \)[/tex]
- Width ratio: [tex]\( \frac{1 \, \text{m}}{4 \, \text{m}} = 0.25 \)[/tex]

The ratios are not equal, so these dimensions do not maintain the same scale as the original garden.

### Conclusion:
After examining all the options, the dimensions that maintain the same scale as the original garden [tex]\(4 \, \text{m} \times 20 \, \text{m}\)[/tex] are:
[tex]\[ \boxed{40 \, \text{cm} \times 200 \, \text{cm}} \][/tex]