Math Problem Statement

A statue and a model of the statue are mathematically similar. The statue has a total surface area of 3600 cm2 The model has a total surface area of 625 cm2 The volume of the model is 750 cm2 Work out the volume of the statue. [HINT: First find the ratio of the lengths of the statue]

Solution

To find the volume of the statue, we’ll use the fact that the statue and the model are mathematically similar. Here’s the process:

Step 1: Find the Ratio of the Surface Areas

The surface area of the statue is 3600cm23600 \, \text{cm}^2, and the surface area of the model is 625cm2625 \, \text{cm}^2.

Since they are similar, the ratio of the areas (surface areas) is given by: Area Ratio=Surface Area of StatueSurface Area of Model=3600625\text{Area Ratio} = \frac{\text{Surface Area of Statue}}{\text{Surface Area of Model}} = \frac{3600}{625}

Simplifying this, we get: Area Ratio=3600÷25625÷25=14425\text{Area Ratio} = \frac{3600 \div 25}{625 \div 25} = \frac{144}{25}

So, the area ratio is 14425\frac{144}{25}.

Step 2: Determine the Ratio of the Lengths

The area ratio for similar figures is the square of the length ratio. So, if the length ratio is kk, then: k2=14425k^2 = \frac{144}{25}

To find kk, take the square root of both sides: k=14425=14425=125k = \sqrt{\frac{144}{25}} = \frac{\sqrt{144}}{\sqrt{25}} = \frac{12}{5}

Thus, the length ratio is 125\frac{12}{5}.

Step 3: Determine the Ratio of the Volumes

The volume ratio for similar figures is the cube of the length ratio. So: Volume Ratio=k3=(125)3\text{Volume Ratio} = k^3 = \left(\frac{12}{5}\right)^3

Calculating this: Volume Ratio=12353=1728125\text{Volume Ratio} = \frac{12^3}{5^3} = \frac{1728}{125}

Step 4: Find the Volume of the Statue

Now, we know the volume of the model is 750cm3750 \, \text{cm}^3, and we can use the volume ratio to find the volume of the statue: Volume of Statue=Volume of Model×1728125\text{Volume of Statue} = \text{Volume of Model} \times \frac{1728}{125}

Calculating this: Volume of Statue=750×1728125=10368cm3\text{Volume of Statue} = 750 \times \frac{1728}{125} = 10368 \, \text{cm}^3

Final Answer

The volume of the statue is: 10368cm3\boxed{10368 \, \text{cm}^3}

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Related Questions

  1. If the length of the model is 20 cm, what is the length of the statue?
  2. How would the volume change if the model’s surface area was 500 cm² instead of 625 cm²?
  3. What would the volume of the statue be if the model’s volume were doubled?
  4. What is the volume ratio if the surface area of the model is 900 cm² and the statue remains the same?
  5. How does the area ratio relate to the volume ratio in similar geometric objects?

Tip: For similar objects, remember that area scales by the square of the length ratio, and volume scales by the cube of the length ratio.

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Math Problem Analysis

Mathematical Concepts

Similar Figures
Ratio and Proportion
Surface Area and Volume Scaling

Formulas

Area Ratio = Surface Area of Statue / Surface Area of Model
Length Ratio = sqrt(Area Ratio)
Volume Ratio = (Length Ratio)^3
Volume of Statue = Volume of Model * Volume Ratio

Theorems

Similarity Theorem for Geometric Figures

Suitable Grade Level

Grades 9-10