8. For circle A, the circumference is 31.4 ft. What is the area? Use 3.14 for pi
2 answers:
Answer:

Step-by-step explanation:
Circumference = C = 31.4 ft
We know that,
<h3>C = 2πr</h3>
Where, r is the radius
31.4 = 2(3.14)r
31.4 = 6.28(r)
Divide 6.28 to both sides
31.4/6.28 = r
5 ft. = r
<h3>r = 5 ft.</h3>
Now,
<h3><u>Finding area:</u></h3>
A = πr²
A = (3.14)(5)²
A = (3.14)(25)
<h3>
A = 78.5 ft²</h3>
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
To solve this problem, you need to find a radius... Circumference=2(3.14)(r)
2(3.14)=6.28
31.4/6.28=5=radius
A=(3.14)(r^2)
A=(3.14)(5^2)=78.5
Area= 78.5 ft^2
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