calculate circumference circle?
338526
diameter x pi\npi=3.14159...\n\nthat's it
601593
Circumference is the distance around a circle.  2 times pi ( which is about 3.14) times the radius (the distance from the center of the cirle to any side).  In formula form it looks like this C = 2*Pi*r.\n\nThe formula for area of a circle is A = Pi*r^2 ( also known as r squared)
289682
circumference = pie times diameter\nradius is half of the diameter\n\nso if you have either the circumference or the diameter, you can figure it out.
383882
Lets do the math:\n5.5 inches around (Circumference = C)\n(Diameter = D)\n(π = Pi)\n\nD = (C/π)\nD = (5.5/π)\nD ≈ 1.751 inches\n\nSo, your member is 7 inches long, it is 5.5 inches around (Circ), 2 inches wide at the top, but it is 1.75 inches wide at the point you measured the circumference.  Since the 2 inch measurement was at the top, then the 1.75 inch measurement must have been below that.  So your member grows a quarter of an inch the longer it gets.  That is one interesting "member."  Maybe you should pull that ruler out and get a little better measurements.
114473
If circumfrence = C (assume)\n   radius = r       (assume)\n   pi     = 3.14  or 22/7  (known value)\n\nthen :   C= 2 x (pi) x r \n          = 2 x  3.14 x 31/2\n          = 3.14 x 31   ( 2 gets cancelled out from the \n                          numerator and denominator)\n\n          = 97.34 units ( answer)
763047
Angle 2*pi is one revolution, so this arc is the circumference!\n2*pi*radius = 18*pi\n\nThere is also the general formula \narc length = radius * angle (in radians), which of course gives exactly the same result here.  But after 2 hours I guess you're not there to see this answer!  Sorry no-one responded earlier.
1031813
use the formula pi*r^2*h\nwhere pi=1.34\n r=radius (in inches)\n  h=height of cylinder (inches)
218157
circumference = pi * diameter\n\nso...\n\ncircumference = pi * (6 * 2) = 12pi ft.
1120961
Simply put, a string can be used to go around the circle. Mark where the first end meets the other then measure on a ruler. Record that. Then u measure the diameter ( the line that parts in two equal parts). Divide the diameter into the circumference and u r supposed to get 3.14 or close to that which is pi. So pi is the ratio of the diameter to circumference. Simply put!!!
914474
well from my understanding there is 360 degrees in the circumference of a circle so divide that by 12 and you get 30 so every 30 degrees mark it.\nI hope i am not to wrong here!\n\nUnless its bigger but you can draw it down to fit that scale, that's not hard.
940374
Its the circumference of any circle divided by its diameter.
836396
circumference= 2*r*pi\nwhere r is the radius and pi is approximately 3.14
160871
Divide 34 by PI...that will give you the diameter.\n\nDiameter = Circumference / PI
323605
Area of a circle = pi x r^2 =3.1416 x 4^2=50.265 cm^2\nArea of a circle = pi x (d^2)/4 = 3.1416 x (8^2)/4 = 50.265 cm^2\n\nCircumference of a circle = pi x diameter = 3.1416 x 8 =25.133 cm\nCircumference of a circle = pi x 2 x radius = 3.1416 x 2 x 4 =25.133 cm
579127
what is the diameter....? Just multiply the diameter times pi. (3.14)
953348
pi= the circumference of a circle divided by the diameter\n\napprox 3.14159
344528
The formula is as follows:\n\nC\n- = pi\nd\n\nC=the circumference\nd=the diameter\nand pi=3.14\n\nThe next step is to put all the known information into the equation:\n\nC\n- = 3.14\n14\n\nOnce you have that, you can multiply 14 by both sides to get C alone. Like this:\n\n14( C/14) = (3.14)14\n\n14 is canceled on the side with C, and the you take 3.14 and multiply it by 14 to get 43.96. So now the equation looks like this:\n\nC = 43.96\n\nAnd there you have your answer. The circumference of the circle with a diameter of 14 is 43.96\n\nHope this helped.