Circle

How big is an area of a circle if its circumference is 51.2 cm?

Correct answer:

S =  208.61 cm2

Step-by-step explanation:

o=51.2 cm o = 2 π r  r=2πo=2 3.141651.28.1487 cm  S=π r2=3.1416 8.14872=208.61 cm2



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