User:Gluespill

Euclidean space rambling:: Circumference (symbol c): A curved line that defines the outside edge of a circle. (length of) Diameter (symbol d): A line segment that passes through the center point of a circle with both endpoints on that circle's circumference. (length of) Radius (symbol r): A line segment with one endpoint on the center point of a circle and the other anywhere on that circle's circumference. (length of) d=2r, r=d/2 Pi (symbol π) : the ratio of a circle's circumference to it's diameter π = c/d, π=c/2r Area of circle (symbol) A: A = π × r × r A = [c/2r] × r × r = (r × r × c)/2r = (r × c)/2 A = (c × r) / 2 Gluespill (talk) 19:08, 25 May 2010 (UTC)