How do you find the circumference of a circle?
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)
234883
The symbol p is called pi and is approximately equal to 22/7 or 3.141592654 , most high school teachers use it to two decimal places as 3.14\np is the ratio between the circumference and the diameter of a circle ..i.e \np = (circumference / diameter ).\nInterestingly the value of p is the same for any circle ... \n\nArea of circle = p x ( radius x radius ) = p radius2\n\nif the Radius = R \nthen \nArea of circle = pR2 = p x R x R \n\nHere's an example:\nFind the area of the circle with radius 10 cm ..use p as 3.14\nAnswer\nHere we have :\nRadius = 10 cm\np = 3.14\n\nUsing the formula Area of circle = p radius2 = p x radius x radius \n\nreplacing radius with 10 cm and p with 3.14 in above formula we have\n\nArea of circle = p radius2 = p x radius x radius = 3.14 x 10cm x 10cm = 3.14 x 100 cm2 = 314 cm2
40239
A= pi x Radius(squared)\nA= 3.14 x 10 (squared)\nA= 3.14 x 100\nA= 314\n\n*2piR is the formula to find the CIRCUMFERENCE of a circle. (the second answer is wrong.)
71470
3.1416 X radius squared\n12" circle= 6" radius\n6" X 6" = ? X 3.1416(pi)= ?\nGot the picture?\nNot going to do your homework for you.\n\n(sorry Lucky Lady but pi X diameter is the circumference)
668236
Simple algebra, just rearrange the equation.\n\nYou obviously know the formula for the area of a circle:\n\nA = pi r²\n\nSo solve this for r as follows:\nDivide both sides by pi\nA/pi = r²\n\nTake the square root of both sides\nsqrt(A/pi) = r\n\nSo plug in your value of A = 50.24 and solve\nr² = 50.24 / 3.14159 = 16\nr = 4
229888
So 2*pi*radius = circumference.  And you know the circumference, so set up a little equation and solve for the radius.\n2 pi R = 4 pi\ncancel the 2 and the pi to get\nR = 2\nNow you can easily find the area using Area = pi * R^2
889030
circumference = 2 times 3.14 times radius = 6.28 times 0.09m = 0.5652\n\n7 divided by 0.5652 = 12.385\n\nanswer is 12.4
1135397
I think Circumference=pir2 (or pi times the radius squared)
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!!!
406577
it's approximately 6 m.\n\nthe formula that relates diameter and circumference is:\n\nCircumference = pi * diameter\n\n18.85 = 3.14 * d\n\n18.85/3.14 = d\n\n6.00 = d  <-- answer
680200
Assuming this means a circle...\n\ndefn/:\n\nc=circurmfernce\nA=area\nr=radius\nd=diameter\npi=pi (~3.1415926...)\nd=2*r\n\nC=2*pi*r=d*pi\nA=pi*(r^2)...(area is pi*r squared...pie are squared-no there not their round).\nA=pi*(d^2)/4.\n\njust plug and chug...\n\nC=10*pi.\nA=25*pi.\n\nanswer:\n\nit's that simple
620052
You can calculate pi, the ratio of circumference to diameter using several formulae:\n\npi = 4(1 - 1/3 + 1/5 - 1/7 ...)\n\npi = (3*sqrt(3))/4 + 24(1/12 - 1/(5*2^5) - 1/(28*2^7)...)\n[ the nth coefficient can be found using:\n0.25(2n -1) sqrt(x-x^2) - 0.125 * asin(1-2n) ]\n\nnote: pi does NOT equal exactly 22/7.
658093
Given the nature of the values I am assuming they are identifying the circumference.    \nC = 2 * pi * radius = pi * diameter.   \nSo, to find the diameter we would divide out the pi or use 3.14 to get to the diameter for each value.  \nHope this helps.
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)
303304
Use the well known formulas that relate the radius and diameter of a circle to its circumfrence.\n\nC = pi * D\nC = 2 * pi * R\n\nFor pi, you can use 3.14 or 22/7, or whatever value your teacher wants you to use.
593161
Simply use the corresponding equations. The circumference of a circle is Pi times the diameter and the area of a circle is Pi/4 times the diameter squared.\nThus doubling the diameter doubles the circumference, and quadruples the area.
858274
of a circle? you multiply 2 * pi * radius = circumference\nor\nmultiply 2 * diameter = circumference