What is the radius of a circle that has a circumference of 81 π square inches? A. 9 inches B. 18 inches C. 40.5 inches d. 81 inches

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asked Feb 16, 2022 224k views

21 votes

What is the radius of a circle that has a circumference of 81 π square inches?

A. 9 inches
B. 18 inches
C. 40.5 inches
d. 81 inches

Mathematics
middle-school

Kevin Li asked

by Kevin Li

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2 Answers

7 votes

2 the reason why is because I need 5 points. Hope that helps!

Anoushka Seechurn answered Feb 18, 2022

by Anoushka Seechurn

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11 votes

Answer:

r≈12.89

Explanation:

Using the formula

C=2πr

Solving for r

r=C

2π=81

2·π≈12.89155

Rens Groenveld answered Feb 21, 2022

by Rens Groenveld

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