Circle - simple

Calculate the area of a circle in dm2 if its circumference is 31.4 cm.

Correct answer:

S =  78.46 dm2

Step-by-step explanation:

o=31.4 cm o = 2π r r=2πo=2 3.141631.44.9975 cm  S=π r2=3.1416 4.99752=78.46 dm2



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