Multiplying the diameter by pi (approx 3.1416) will give you the circumference of the circle.
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circumference of a circle = pi * diameter.
Circumference of a circle = pi*diameter or 2*pi*radius
circumference of a circle = diameter*pi or 2*pi*radius
the circumference of the circle divided by pi (button or 3.14) - Maths
To find the circumference of a circle when given the diameter, you can use the formula C = πd, where C is the circumference, π is pi (approximately 3.14159), and d is the diameter. Given the diameter of 84cm, you can plug this into the formula to get C = 3.14159 * 84 = 263.893cm. Therefore, the circumference of the circle is approximately 263.893cm.