Question

A circular piece of fabric has a radius of 1. 2 ft. The fabric sells for $5. 40 per ft². What is the total cost of the circular piece of fabric? use 3. 14 for pi. $6. 48 $20. 35 $24. 42 $40. 69.

Answer 1

$24.42

Explanation:

3.14*r^2= area

3.14*1.2^2=4.52

5.40*4.52=24.42

Answer 2

Explanation:

Remark

First find the area of the circular piece of fabric. Then deal with cost per square foot.

Area of the fabric

Area = pi * r^2

Area = 3.14 * 1.2^2

Area = 3.14 * 1.44

Area = 4.5216 square feet

Cost

1 square foot costs 5.40 dollars

4.5216 square feet costs x Cross multiply

x = 5.40 * 4.5216

Answerx = 24.42 dollars for the fabric bought.