Question

Find the circumference of the circle.
​
​Use
as an approximation for .

Answer 1

Diameter of the circle=21 cm

Radius of the circle=21/2 cm

Circumference of the circle is 2×π×(radius)

Circumference=2×22/7×21/2= 66 cm

66 cm is the right answer.

Answer 2

21piecm

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