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circle with center at (0,0)
x2 + y2 = r2
circle with center at (x1,y1)
(x-x1)2 + (y-y1)2 = r2

volume of cone
V = 1/3πr2h

volume of sphere
V = 4/3πr3

volume of cylinder
V = πr2h

area of circle
A = πr2

area of triangle
A = 1/2bh
area of trapezoid
A = 1/2h(b1+b2)

circumference of circle
C = 2πr
ln e =
1
ln 1
0