Question

what us the circumference of 5cm use 3.14​

Answer 1

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Circumference of a cicle in terms of radius:

Circumference = 2·π·r = 2·3.14·2.5 = 15.7(*)

In terms of diameter:-

Circumference = π·d = 3.14·5 = 15.7(*)

In terms of area:-

Circumference C = √4·π·A = √4·π·19.63 = 15.7(*)

(*) 15.71 cm exactly or limited to de precision of this calculator (13 decimal places).

Note: for simplicity, the operations above were rounded to 2 decimal places and π was rounded to 3.14.