Find out the circumference of a circle whose diameter is 21 cm?

Find out the circumference of a circle whose diameter is 21 cm?

21 செ.மீ விட்டமாக கொண்ட வட்டத்தின் சுற்றளவு காண்க.

(A) 66 cm

(B) 33 cm

(C) 65.94 cm

(D) 62 cm

(E) Answer not known

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