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hjlf
4 years ago
13

4.What's the radius of a circle with an area of 123 square feet?

Mathematics
1 answer:
777dan777 [17]4 years ago
6 0
Area of circle is 'pi'r^2
pi r^2 = 123
r^2
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Can someone help me plz am stuck on this.
chubhunter [2.5K]
First Question

circumference = pi * diameter

diameter = circumference/pi = 94.2 in./3.14 = 30 in.

The wheels have a 30-inch diameter.
-----------------------------------------------------------------------
Second question

The area of a circle: area = pi * r^2

radius = diameter/2 = 94.2 in./2 = 47.1 in.

area = pi * r^2 = 3.14 * 47.1 in. * 47.1 in. = 6966 in.^2

Answer: 6966 in.^2
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Third question

The piece of felt has a width equal to the diameter of the wheel. The length has to be the same as 4 diameters.

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Answer: 376.8 in.
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3 years ago
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