Circumference equals pi times the diameter, so you would divide by pi. (3.14159265...)
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diameter: you have stated that it is 3.14 radius: half the diameter, therefore 1.57 circumference: pi times the diameter, therefore 3.14 x 3.14 = 9.86 area: pi times the radius squared, therefore 3.14 x 2.46 = 7.72
Circumference of the circle: 2*pi*9 = 18*pi cm
I thought circumference is only with circles Absolutely correct, but even if you consider the perimeter, which is conceptually similar, there is no answer. A rectangle with an area of 24 could be 4*6 with a perimeter of 20 or it could be 1*24 with a perimeter of 50 or 0.5*48 with a perimeter of 97 etc
The question is in really bad english, but I'm guessing your meant: 'How do I work out the diameter using pi?' Diameter= Radius2 You don't need to use Pi to work out the diameter. Unless you have a question that doesn't show you the radius. Then you do Area divided by Pi which equals the Diameter.
The number of all possible angles is infinite and no figure can show them all.