The radius of in-circle is given by the formula DERIVATION
Derivation of Formula for Radius of Circumcircle
The formula for the radius of the circle circumscribed about a triangle (circumcircle) is given by
Derivation of Formula for Area of Cyclic Quadrilateral
For a cyclic quadrilateral with given sides a, b, c, and d, the formula for the area is given by DERIVATION OF THE FORMULA
ARITHMETIC PROGRESSION – FORMULAS
Arithmetic Progression definition Arithmetic Progression (also called arithmetic sequence), is a sequence of numbers such that the difference between any two consecutive terms is constant. Each term therefore in an arithmetic progression will increase or decrease at a constant value called the common difference, d. Examples of arithmetic progression are: 2, 5, 8, 11,... common difference … Continue reading ARITHMETIC PROGRESSION – FORMULAS