Circumference 61704

Calculate the area of a circle if its circumference is 21.98 dm. Express the result in square decimetres.

Correct answer:

S =  38.4455 dm2

Step-by-step explanation:

o=21.98 dm  o=2 πr  r=2πo=2 3.141621.983.4982 dm  S=π r2=3.1416 3.49822=38.4455 dm2

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