Math Problem Statement

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

Solution

To find the area of a circle, you can use the formula:

A=πr2A = \pi r^2

Where:

  • AA is the area,
  • rr is the radius, which is half the diameter.

Given that the diameter is 14 meters, the radius rr is:

r=142=7mr = \frac{14}{2} = 7 \, \text{m}

Now, substitute the radius into the formula for the area:

A=π(7)2=π(49)A = \pi (7)^2 = \pi (49)

Using π3.1416\pi \approx 3.1416:

A3.1416×49=153.9384m2A \approx 3.1416 \times 49 = 153.9384 \, \text{m}^2

Rounding to the nearest tenth:

A153.9m2A \approx 153.9 \, \text{m}^2

Thus, the area of the circle is approximately 153.9 square meters.

Would you like more details or have any questions?

Here are 5 related questions to further explore:

  1. What is the circumference of the circle with a diameter of 14 m?
  2. How would the area change if the diameter were doubled?
  3. What is the radius of a circle whose area is 314 square meters?
  4. How do you calculate the area of a sector of a circle?
  5. What is the area of a circle with a radius of 10 meters?

Tip: Always remember that the area of a circle grows quadratically with the radius, meaning if the radius doubles, the area quadruples!

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Math Problem Analysis

Mathematical Concepts

Geometry
Circle Area

Formulas

Area of a circle: A = πr²

Theorems

Properties of circles

Suitable Grade Level

Grades 6-8