Math Problem Statement

he diameter of a circle is 11 cm. Find its area to the nearest teNTH PLACE

Solution

To find the area of the circle, we use the formula for the area of a circle:

A=πr2A = \pi r^2

where:

  • AA is the area,
  • π\pi is approximately 3.1416, and
  • rr is the radius of the circle.

The radius rr is half of the diameter. Given that the diameter is 11 cm, we find:

r=112=5.5cmr = \frac{11}{2} = 5.5 \, \text{cm}

Now, we can calculate the area:

A=π×(5.5)2A = \pi \times (5.5)^2

A=3.1416×30.25A = 3.1416 \times 30.25

A95.03cm2A \approx 95.03 \, \text{cm}^2

So, the area of the circle to the nearest tenth is approximately 95.0 cm².

Would you like to explore more details about this calculation, or have any other questions? Here's a list of related questions:

  1. How would the area change if the diameter was 15 cm instead?
  2. How do you derive the formula for the area of a circle from its circumference?
  3. What other ways can you calculate the area of a circle if you know the perimeter?
  4. What is the relationship between the radius, diameter, and circumference of a circle?
  5. How would the area change if you doubled the radius of the circle?

Tip: The formula for the area of a circle can also be expressed using the diameter directly: A=πd24A = \frac{\pi d^2}{4}.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circles
Area Calculation

Formulas

A = πr²
r = d / 2

Theorems

Formula for the area of a circle

Suitable Grade Level

Grades 6-8