does anyone know some simple math equations with Pi? i.e. area of a circle?
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area of a circle: pi*r^2\nCircumfence: 2*pi*r
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Cylinder: (pi)*(radius^2)*(height)\nPrism: (area of the base)*(height)
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The question is a little faulty but I think I know what you meant.\n\nIf d is 30.5, then r is half that, 15.25.  You mean pi which is about 3.14.\n\nIf I use that value of pi, and r is 15.25, then area is pi r squared, or 3.14 x 15.25 x 15.25 which is 730.24625.\n\nUsing a better value of pi, I got 730.61664.
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triangle area = 1/2(height * width)\n\ncircle area = pi * radius^2
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2 X pi X  r = cirumference\n\npi X r squared = area
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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
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areah of a circle=pie times r squared  (r is radius)\ndiameter= 2r\nso r= d/2\n\nso you do 6sqrt(3)  divided by 2\n(you get 3 times sqrt of 3)\nthen do that number sqared....times pie(3.14)\n(18 times pie...more accurate if use calculaterbut answer is 18x3.14......)
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diameter x pi\npi=3.14159...\n\nthat's it
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pi*(r^2)\n\nIt doesn't matter which unit you use, just make sure you're consistent.
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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)
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Area of a circle = pi * r^2\n= pi * 118^2  <--take half of 236 mm to find the radius\n= 43744 mm^2\n\nArea of a square = s^2\n43744 = s^2\ns = 209 mm\n\nSo your square has to have sides of 209 mm if it will have the same area as the circle above.
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Area = Pi x R squared\nArea = Pi x (x - 6) squared\nArea = Pi x (x^2 - 12x + 36)\nArea = Pix^2 -Pi12x + Pi36\nArea = 3.14x^2 - 37.68x + 113.04\n\n(Using the approximation 3.14 for Pi)\n\nOf course, it has been a while and I'm a little rusty...
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pi*(radius)^2*height\n\npi is aprox. 3.14 or 22/7
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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.
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area := Πr2\ncircumference := Πd  ,  r=radius, d=diameter, Π=3.14128....
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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
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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