if the radius of a circle is 31/2 whats the circomfrence?
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)
48612
Let r be the radius of the circle and s the length of the square's sides.\ncircle perimeter=2*pi*r, square perimeter=4*s\n2*pi*r=4*s => s=pi*r/2\ncircle area=pi*r^2, square area=s^2\ns^2=(pi*r/2)^2=pi^2*r^2/4\nBut pi<4 => pi^2*r^2/4<pi*r^2 => square area < circle area
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
914363
Find the center-radious form of the equation of the circle with center = (2,-6) and the tangent to the y-axis.\n\nIf tangent to the y - axis then the point (0, -6) is the point of contact (as tangent to circle _|_ radius at point of contact)\n\nTherefore radius = 2\n\nTherefore required circle is\n\n(x - 2)² + (y + 6)² = 2²
146689
to find the area of a circle.pie r squared.r being 1/2 dia.
335828
The radius is half the diameter.\nThe diameter is twice the radius.\nd = 2r\n8 = 2r\nr = 8/2\nr = 4 inches
667615
I'm sorry, miscalculated\nArea of a Circle= pi r^2\n3.14 x (5)^2\n3.14 x 25\nArea of the Circle is 78.5 meters
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)
53953
Area of a circle is pi times radius square.\n\nPi is 22/7 and radius is 2 squared\nA=22/7*2^2\nA=22/7*4\nAis apprx. 12.57
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.)
492563
This cannot be the whole question.  Since you are using the letters r and d, I will assume you are talking about radius and diameter.\nAre you trying to find the area? then use the formula\nA = Pi*r^2\nIf you are trying to find circumference, then use\nC = 2*Pi*r\nRemember that d = 2r (diameter is twice the radius)
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.
183956
Half the diameter, or circumference divided by 2.pi
511828
I want to point out first that the formula for perimeter of a circle is (pi)d or 2(pi)r, not (pi)r^2- (pi)r^2 is for the area!\n\nAnyway, P= (pi)d\n         = 8pi\nDivide that by two since it's just a half circle\n         =4pi\nAdd 8 to that, and there you have it, the perimeter!\n\nFinal Answer- 4pi+8 or 20.56cm^2
927299
It means "2 times pi times r" (where r is the radius of the circle)
67030
If its a circle inscribed within a triangle then the largest will be the incircle of that triangle... the radius of which is given by: (area of triangle)/semi-perimeter...\nsemi-perimeter(s) = (a+b+c)/2\narea of triangle = square root of[s(s-a)(s-b)(s-c)]\na, b, c -> are the sides of the triangle...\n\nonce u know the radius u can calc the area of the circle...
917141
the radius is half the diameter.