Suppose you take a straight piece of wire measuring 20 cm and cut it to make two pieces. You then take one piece and make it into a square, and the other piece and make it into a circle, like in the following picture: 20 cm 20-x а. Write a function, 4), that gives the total area of the circle and the square you make in this scenario. b. What is the domain of A(.x)?

Algebra and Trigonometry (6th Edition)
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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### Problem Description

Suppose you take a straight piece of wire measuring 20 cm and cut it to make two pieces. You then take one piece and make it into a square, and the other piece and make it into a circle, like in the following picture:

![Diagram showing a wire of length 20 cm divided into two pieces, 'x' and '20 - x', with one piece forming a circle and the other forming a square.](image_url_here)

### Questions

a. Write a function, \( A(x) \), that gives the total area of the circle and the square you make in this scenario.

b. What is the domain of \( A(x) \)?

### Detailed Explanation

To solve this problem, we first need to use the lengths of the wire pieces for both the circle and the square.

1. **Dividing the Wire**:
   - Let \( x \) cm be the length of the wire used to form the circle.
   - Then, \( 20 - x \) cm will be the length of the wire used to form the square.

2. **Forming the Circle**:
   - The circumference of the circle is \( x \) cm.
   - Using the formula for the circumference of a circle, we have:
     \[
     2\pi r = x
     \]
   - Solving for the radius \( r \), we get:
     \[
     r = \frac{x}{2\pi}
     \]
   - The area of the circle, \( A_{\text{circle}} \), is given by:
     \[
     A_{\text{circle}} = \pi r^2 = \pi \left( \frac{x}{2\pi} \right)^2 = \frac{x^2}{4\pi}
     \]

3. **Forming the Square**:
   - The perimeter of the square is \( 20 - x \) cm.
   - Each side of the square, \( s \), is:
     \[
     s = \frac{20 - x}{4}
     \]
   - The area of the square, \( A_{\text{square}} \), is given by:
     \[
     A_{\text{square}} = s^2 = \left( \frac{20 - x}{4} \right)^2 = \frac{(20 - x)^2}{16}
Transcribed Image Text:### Problem Description Suppose you take a straight piece of wire measuring 20 cm and cut it to make two pieces. You then take one piece and make it into a square, and the other piece and make it into a circle, like in the following picture: ![Diagram showing a wire of length 20 cm divided into two pieces, 'x' and '20 - x', with one piece forming a circle and the other forming a square.](image_url_here) ### Questions a. Write a function, \( A(x) \), that gives the total area of the circle and the square you make in this scenario. b. What is the domain of \( A(x) \)? ### Detailed Explanation To solve this problem, we first need to use the lengths of the wire pieces for both the circle and the square. 1. **Dividing the Wire**: - Let \( x \) cm be the length of the wire used to form the circle. - Then, \( 20 - x \) cm will be the length of the wire used to form the square. 2. **Forming the Circle**: - The circumference of the circle is \( x \) cm. - Using the formula for the circumference of a circle, we have: \[ 2\pi r = x \] - Solving for the radius \( r \), we get: \[ r = \frac{x}{2\pi} \] - The area of the circle, \( A_{\text{circle}} \), is given by: \[ A_{\text{circle}} = \pi r^2 = \pi \left( \frac{x}{2\pi} \right)^2 = \frac{x^2}{4\pi} \] 3. **Forming the Square**: - The perimeter of the square is \( 20 - x \) cm. - Each side of the square, \( s \), is: \[ s = \frac{20 - x}{4} \] - The area of the square, \( A_{\text{square}} \), is given by: \[ A_{\text{square}} = s^2 = \left( \frac{20 - x}{4} \right)^2 = \frac{(20 - x)^2}{16}
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