Math Problem Statement

A scale drawing of a circular pool is shown. If the scale of the drawing is 2 cm = 11 feet, what is the actual area of the pool? Use 3.14 for π.

Solution

Let's solve the problem based on the details in the image.

Given:

  1. Scale: 2cm=11feet2 \, \text{cm} = 11 \, \text{feet}
  2. Radius in the drawing: 6cm6 \, \text{cm}
  3. Formula for area of a circle: A=πr2A = \pi r^2
  4. Use π=3.14\pi = 3.14.

Step 1: Convert the radius in the drawing to the actual radius

The scale ratio is 2cm:11feet2 \, \text{cm} : 11 \, \text{feet}. For 6cm6 \, \text{cm} in the drawing:

Actual radius=(112)6=33feet.\text{Actual radius} = \left(\frac{11}{2}\right) \cdot 6 = 33 \, \text{feet}.


Step 2: Calculate the actual area

The formula for the area of a circle is A=πr2A = \pi r^2. Using the actual radius r=33feetr = 33 \, \text{feet} and π=3.14\pi = 3.14:

A=3.14(33)2A = 3.14 \cdot (33)^2

A=3.141089=3415.86square feet.A = 3.14 \cdot 1089 = 3415.86 \, \text{square feet}.


Final Answer:

The actual area of the pool is 3415.86 square feet.

Would you like a detailed breakdown of the steps or more help?


Related Questions:

  1. What would the area be if the radius in the drawing were 10 cm instead?
  2. How would the area change if the scale was 1cm=5feet1 \, \text{cm} = 5 \, \text{feet}?
  3. How do you find the circumference of the pool with the same dimensions?
  4. Can you solve this using a different value of π\pi, such as 227\frac{22}{7}?
  5. What is the diameter of the actual pool in feet?

Tip:

Always double-check your scale conversions before calculating areas in scaled problems!

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Math Problem Analysis

Mathematical Concepts

Geometry
Scale Conversions
Area of a Circle

Formulas

Area of a Circle: A = πr²
Scale Conversion Formula

Theorems

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Suitable Grade Level

Grades 6-8