The circumfrence of a circle is pi units. What is the diameter of the circle?
100213
Diameter will be 1 units\n\nCircumference =piD\nif Circumference =pi\nthen D=1
5380
the answer to your question is simple..first find the equation for the circumference of a circle which would be 2 times pi times radius..which gives you the answer 29.516 if you round to the nearest 10th your answer would be 29.5cm
860968
u can use the following formulas to find the radius\n1)Area of circle=pi.*(radius)^2\nwhen area is given plug in that value into this formula and u can get the radius\n2)radius=diameter/2\nwhen the diameter is given,find the radius by dividing the diameter by 2\n3)circumference=2*pi.*r\nwhen the circumference is given use the above formula to solve for the radius\n\nthere is no definite formula for the radius but depending the other value given u can solve for the radius.\nhope that helps!!!
831242
This is just the inside of the unit circle including its circumference.\nThe unit circle (circle at the origin with radius=1) is\nx^2 + y^2 = 1\nAnd you want x^2 + y^2 ≤ 1\nso its the circle plus its inside.\n( if it had been x^2 + y^2 ≥ 1 it would be the circle plus everything outside )\nIf you wanted x in terms of y, you just get |x| ≤ √(1-y^2) .
408251
Measure the diameter and multiply by pi (3.1415)
1148959
Circumference = pi x diameter.\n\ndiameter = Circumference / pi\n\ndiameter = 40 / pi\ndiameter = 12.7323954 cm
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.)
129445
Pi is the ratio of the circumferance of a circle to its diameter.  The following equation is for the area of a circle:    A = pi*r^2\n\nThe Math Forum website has a very complete and east-to-understand explanation.
35682
pi doesn't equal 22/7 or 3.14.  those are just approximates, but fairly close approximates.\n\npi is how many radians there are in a half a circle-approximately 22/7 or 3.1415 radians.  a radian is the degree where the radius of the circle equals the outside segment of the circle at that degree.  (about 59 or so degrees if i remember correctly)
858274
of a circle? you multiply 2 * pi * radius = circumference\nor\nmultiply 2 * diameter = circumference
1173297
Well, the circumscribed cylinder will have a radius equal to that of the sphere, and a height equal to the sphere's diameter (which is twice its radius).\n\nS.A. of a sphere = 4*pi*r^2\n\nS.A. of the lateral part of a cylinder = (perimeter of endcap)*(height of cyl.)\n= (2*pi*r)*(diam. of sphere)\n= (2*pi*r)*(2*r)\n= 4*pi*r^2\n\nQ.E.D. :)\n\nHope that helps.
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.
1158388
In Euclidean plane geometry, π(Pi) is 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. π may be defined in many other ways, for example as the smallest positive x for which sin(x) = 0. See other formulas below. All these definitions are equivalent.\n\nArea of Circle = Pi.(Radius)^2\nPerimeter of Circle (Circumference)=2.Pi.Radius.\nYes .. it has someting to do with Statistics :\n\nIn probability and statistics, there are many distributions whose formulæ contain π, including:\n\nprobability density function (pdf) for the normal distribution with mean μ and standard deviation σ : \nhttp://en.wikipedia.org/wiki/Pi
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)
269071
Okay, what you want to do is find the circumference of the circle. That's 2(pi)r. That's 37.69911184... . Next find 32 as a decimal of this number - 32/(true cicumference). The fractional decimal is 0.8488263632... . Finally take this percentage and multiply it by 360 and you get 305.5774907... degrees or 305 degrees (accurate to 3 s.f.)
1165863
Find the area of the base (the round part), then multiply by the length.  They gave you the circumference as 3.5 inches, so divide this by 2*pi to get the radius.\n\npi * (3.5/2pi) * (3.5/2pi) * 14\n(3.5 * 3.5 * 14)/(4 * pi)\n13.64753637013 or approximately 13.648 cubic inches
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.