A circle has a circumference of 28.26cm. what is the area of the circle? show work please

1 answer:

8 0

-circumference is equal to pi×diameter, area is equal to pi×radius^2
-28.26÷3.14=9, 9÷2=4.5, 4.5×4.5=20.25, and 20.25×3.14=63.585
-rounded to the nearest hundredth, the answer is 63.59

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The length of a rectangle is 5ft longer than twice the width if the perimeter is 58 ft find the length and width of the rectangl

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Define x :
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Let the width be x.
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Formula for Perimeter :
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Perimeter = 2 (Length + Width)

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Find Width :
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58 = 2 ( 2x + 5 + x) // Substitute Length and Width into formula
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48 = 6x // Take away 10 from both sides
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x = 8 // Divide by 6 on both sides

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Find Length and Width :
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Width = x = 8 ft
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Answer: The length is 21 ft and the width is 8 ft.
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