english

Morgan is reupholstering an old chair with two circular cushions. Each cushion has a circumference of 7.85 feet. He will

Morgan is reupholstering an old chair with two circular cushions. Each cushion has a circumference of 7.85 feet. He will need two pieces of fabric for each cushion. How many square feet of fabric will he need to cover the cushions? Use Pi = 3.14 and round to the nearest square foot.
can someone explain why it is 20 ft?

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