Math Problem Statement

Calculate the area of a circle with a diameter of 16 inches.

Solution

To calculate the area of the circle shown in the image, we need to use the formula for the area of a circle:

A=πr2A = \pi r^2

The image gives the diameter as 16 inches, so the radius rr is half of that:

r=162=8inchesr = \frac{16}{2} = 8 \, \text{inches}

Using π3.14\pi \approx 3.14, we can now plug the radius into the formula:

A=3.14×(8)2=3.14×64=200.96square inchesA = 3.14 \times (8)^2 = 3.14 \times 64 = 200.96 \, \text{square inches}

So, the area of the circle is approximately 200.96 in², rounded to the nearest hundredth.

Would you like a detailed explanation or have any further questions?

Here are 5 questions that build upon this:

  1. What is the relationship between the radius and diameter of a circle?
  2. How would the area change if the diameter were doubled?
  3. Why is π\pi important in calculating the area of a circle?
  4. Can you calculate the circumference of this circle as well?
  5. How does changing the radius affect the area of the circle?

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
Area of Circles

Formulas

Area of a circle: A = πr²

Theorems

The relationship between the radius and diameter: r = d/2

Suitable Grade Level

Grades 6-8