A round coin has a diameter as 20mm find its circumference take π 3.14
The formula for the circumference of a circle is given by C = πd, where C is the circumference and d is the diameter.
Given that the diameter is 20mm, we can substitute this value into the formula to find the circumference:
C = πd
C = 3.14 * 20
C = 62.8 mm
Therefore, the circumference of the coin is 62.8mm.