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Chapter 2: Problem 16

Find the area of the circle with the given radius or diameter. $$d=1256 \mathrm{ft}$$

Short Answer

Expert verified
The area of the circle is approximately 1,239,446.81 square feet.

Step by step solution

01

Determine if Diameter or Radius

The problem provides the diameter of the circle, which is 1256 ft. We need the radius to find the area.
02

Calculate the Radius

The radius is half of the diameter. Therefore, the radius is calculated as follows: \[ r = \frac{d}{2} = \frac{1256}{2} = 628 \text{ ft} \]
03

Use the Area Formula

To find the area of a circle, use the formula: \[ A = \pi r^2 \].With \( r = 628 \text{ ft} \), we substitute into the formula to get:\[ A = \pi (628)^2 \].
04

Calculate the Area

Perform the calculations using the value of \( pi \) (approximately 3.14159):\[ A = 3.14159 \times (628)^2 \]\[ A \approx 3.14159 \times 394,384 \]\[ A \approx 1,239,446.8096 \text{ square feet} \]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Diameter
In the world of circles, the diameter is a crucial measurement. It refers to the longest distance across the circle, passing directly through the center. Think of it as slicing the circle down its middle, from one edge to the opposite edge. This length is called the diameter, and it is usually denoted by the letter "d."

Here's why diameter is important:
  • It helps in easily understanding the size of a circle.
  • Knowing the diameter allows us to find the radius, which is essential for many calculations involving circles.
In most exercises, you might be given the diameter, and you can always find the radius from it. To do so, simply remember that the diameter is twice the radius. This leads us perfectly into the next concept鈥攖he radius.
Exploring the Radius
The radius is another fundamental feature of a circle, and it signifies half the length of the diameter. The radius extends from the center of the circle to any point on its circumference. It's essentially a building block for numerous circle-related formulas.

Given the diameter, calculating the radius is quite straightforward. You can use the simple formula: \[ r = \frac{d}{2} \] where "r" stands for the radius and "d" represents the diameter.

Knowing the radius is vital for many calculations, especially when finding areas, circumferences, or even working with sectors of circles. By understanding the radius, you unlock the potential to explore the circle more fully.
The Circle Area Formula
Once you have the radius at hand, determining the area of a circle is simple with the help of the circle area formula: \[ A = \pi r^2 \] where:
  • "A" denotes the area.
  • "r" refers to the radius.
  • "\pi" (pi) is a constant, approximately equal to 3.14159.
This formula is derived from the relationship between the radius and the total space enclosed within the circle. By squaring the radius and multiplying it by \( \pi \), you calculate the number of square units needed to cover the circle's interior.

Thus, the concept of area using this formula shows how closely linked the radius and area of a circle are. With just the radius and the universal constant pi, you can determine how large or small any circle is.

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Most popular questions from this chapter

Solve the given problems. A rectangular box is to be used to store radioactive materials. The inside of the box is 12.0 in. long. 9.50 in. wide, and 8.75 in. deep. What is the area of sheet lead that must be used to line the inside of the box?

Solve the given problems. Using a tape measure, the circumference of a tree is found to be 112 in. What is the diameter of the tree (assuming a circular cross section)?

Find the circumference of the circle with the given radius or diameter. $$r=275 \mathrm{ft}$$

In Exercises \(13-20,\) find the area of each figure. Square: \(\quad s=2.7 \mathrm{mm}\)

Solve the given problems. The rim on a basketball hoop has an inside diameter of 18.0 in. The largest cross section of a basketball has a diameter of 12.0 in. What is the ratio of the cross sectional area of the basketball to the area of the hoop?
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