curvature of a circle of radius r is given by
Curvature One way is geometrical. It is natural to define the curvature of a straight line to be constantly zero. The curvature of a circle of radius R should be large if R is small and small if R is large. Thus the curvature of a circle is defined to be the reciprocal of the radius:[2]
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Standard deviation Let X be a random variable with mean value Î¼:
Circle As proved by Archimedes, in his Measurement of a Circle, the area enclosed by a circle is equal to that of a triangle whose base has the length of the circle's circumference and whose height equals the circle's radius,[7] which comes to Ï€ multiplied by the radius squared:
Boyle's law where P is the pressure of the gas, V is the volume of the gas, and k is a constant.
Bracket Forms include round (also called "parentheses"), square, curly (also called "braces"), and angle brackets (also called "chevrons"); and various other pairs of symbols.