well you can divide the circumference by pi (3.14) and it will always give you the diameter or you could measure it.
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If you do not have the area, what do you have? The radius is half the diamiter The radius is PieR2 Worked backwards if you know the circumfrence.
okay so, this week this is what I was doing in math. first, the formula is PiR2 [pies are squared] is what my teacher said. Divide the diameter by 2, to get the radius. multiply the radius by itself, then multiply it by 3.14.
Area of a circle = pi*radius2 measured out in square unitsfor pi use this number 3.14159and remember the radius of a circle = half the diameter.----------------------------------------------------------------Thus a circle with a 10 inch diameter would have an area of:Radius = diamiter/2, which is 10/2= 53.14159 * (5*5) = 78.53975 square inches
To find the area of the circle pi*radius*squared and subtract the area of the figure inside
Circumference ("perimeter") of a circle = (pi) x (diameter of the circle)