Math Problem Statement

The diameter of a circle is 14 m. Find its area to the nearest whole number.

Solution

To find the area of a circle when the diameter is given, you can use the formula:

Area=π×r2\text{Area} = \pi \times r^2

First, find the radius (rr) of the circle, which is half of the diameter:

r=Diameter2=14m2=7mr = \frac{\text{Diameter}}{2} = \frac{14 \, \text{m}}{2} = 7 \, \text{m}

Now, substitute the radius into the area formula:

Area=π×72=π×49m2\text{Area} = \pi \times 7^2 = \pi \times 49 \, \text{m}^2

Using the value of π3.14159\pi \approx 3.14159:

Area3.14159×49153.938m2\text{Area} \approx 3.14159 \times 49 \approx 153.938 \, \text{m}^2

Rounding to the nearest whole number:

Area154m2\text{Area} \approx 154 \, \text{m}^2

So, the area of the circle is 154 square meters.

Would you like more details or have any other questions?

Here are 5 related questions:

  1. How would the area change if the diameter were doubled?
  2. What is the circumference of the circle with the given diameter?
  3. How do you find the area of a semicircle with the same diameter?
  4. What is the relationship between the radius and the area of a circle?
  5. How would the area calculation differ if using an approximate value of π\pi (like 3.14)?

Tip: Always remember that the radius is half of the diameter when working with circles.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circles

Formulas

Area of a circle: π × r²
Radius: Diameter / 2

Theorems

Area formula for a circle

Suitable Grade Level

Grades 6-8