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.
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If you take pi as 22/7 the the circumference is 242 cm.
diameter = circumference/pi
You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi
Diameter = radius * 2 Circumference = pi * diameter.
diameter*pi = circumference