numbers and algebraic expressions
logic, sets, intervals
function and its properties
limits of sequences and functions
derivative and integral of functions
elements of statistics
An area of a circle rotated about its diameter produces a ball. The surface of a ball is the sphere which area can find from formula: P = 4πR^2. The volume of a ball: V = (4/3)πR^3. Any cross section through a ball is area of a circle.