Math.random(): double

static double

random()           Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0.

Heron's formula

From Wikipedia, the free encyclopedia

This article is about calculating the area of a triangle. For calculating a square root, see Heron's method.

In geometry, Heron's (or Hero's) formula, named after
Heron of Alexandria,^[1] states that the area T of a triangle whose sides have lengths a, b, and c 

where s is the semiperimeter of the triangle:

Heron's formula can also be written as:

Heron's formula is distinguished from other formulas for the area of a triangle,
 such as half the base times the height or half the modulus of a cross product of two sides,
 by requiring no arbitrary choice of side as base or vertex as origin.