what is the circumference of a circle that has a diameter of 28ft. use 22/7 for n?
611578
C = pi times diameter\n\n  = 22/7 times 28 = 22 times 4 = 88 ft
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.
1055461
45/360....THATS THE RATIO CZ THE WOLE CIRCLE SUBYENDS A 360 ANGLE WHILE THE ARC SUBTENDS A 45 ANGLE SO THE RATIO OF THE ARC TO CIRCUMFERENCE IS 45/360
253760
well u need it in mensuration when u need 2 find the area of a circle and stuff. it's a very imp constant whose value i 22/7 or 3.14\nalso, 180 degrees = pi radian which u need in physics and calculas
183956
Half the diameter, or circumference divided by 2.pi
39475
Diameter of a circle, I'm assuming?\n\nDiameter = 2 * Radius\nDiameter = Circumference / (2 * pi)\nArea = pi * (diameter / 2)^2
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.)
325893
PI= π = 22/7 = 3.1428571428571428571428571428571\n\nIn Euclidean plane geometry, π may be defined either as the ratio of a circle's circumference to its diameter, or as the ratio of a circle's area to the area of a square whose side is the radius. Advanced textbooks define π analytically using trigonometric functions, for example as the smallest positive x for which sin(x) = 0, or as twice the smallest positive x for which cos(x) = 0.\n\nAll these definitions are equivalent, they amount to the following numerical value of π, truncated to 50 decimal places:\n\n3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510
392733
Divide the circumference of a circle its diameter.
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.
967610
First off, 22/7 is an approximation of pi. Pi is an irrational number that  cannot be written as finite fraction or decimal. Pi is equal to the ratio of the circumference of a circle to its diameter. The initial decimalization of pi is 3.14159... it goes on forever, never with a repeating pattern. 22/7 = 3.14285714285714 which is somewhat close to pi but not the same thing at all.
1106432
Diameter == 10.\nRadius == 5.\nCenter == (1,7)\n\nMethod: use Pythagorean Theorem.
198515
Let's see, if the circumference of the pool is 60 feet and you want to surround the pool (with a gate i'm assuming...not that it matters) so that there is an area of 6 feet between the edge of the pool and the gate (or whatever it is) then you need to first find the diameter. (diameter=distance from one side of the circle to the other which also intersects the center of the circle) You would model this equation as 3(pi)r, (3(pi)r=the formula for the circumference of a circle) 3(pi)r=60. divide both sides by 3 so that the equation reads (pi)r=20.  then divide both sides by (pi) so that the equation reads r=6.366197723675814ft.  You multiply that by 2 so that you get the diameter of the pool so that the equation now reads d=12.732395447351628ft or d=12ft 9in.  You then add 12 feet to that number (6ft extension on either side of the pool) so that the diameter is now 24.732395447351628ft or 24ft 9in.  you divide that by 2 because the formula for circumference of a circle deals with the radius (one-half the diameter) of the circle, not the diameter.  so your model for this situation reads as follows: 3(pi)12.366197723675814ft(or 12ft 4.5 in.)=116.5486677646163 (or 116ft 6.5in) which is how many feet of gate or whatever it would take to surround the pool 6 feet away from the edge of the pool.
44824
find the circumference using C=2(pi)r. r is half of the diameter, so thats 2 times pi times 112.5. this is your distance. speed is distance over time. so now you need to convert minutes to seconds so you can get it in m/s. so you do 10 x 60 and that's 600 seconds. so you just divide the circumference divided by 600 and thats your answer.
1088174
area = pi times the radius squared\n\nThe diameter is twice the radius.\n\nSo divide the diameter in two, square that and multiply by pi.
438426
V = Pi r^2h\nV = Pi(8/2)^2 * 240\nV = Pi(4)^2 * 240\nV = Pi(16)(240) inches \nV = 3840Pi\nV = about 12063.72 in.^3\n\nor\n\n8inches = (2/3)ft\n(2/3)/2 = (1/3)radius\n\nV = Pi(1/3)^2 * 20\nV = pi(1/9) * 20\nV = (20/9)pi\nV = about 6.98 ft^3
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.