In mathematics, a set of symbols and numbers that expresses a fact or rule. For example, A = πr2 is the formula for calculating the area of a circle. E = mc2 is Einstein's famous formula relating energy and mass. Other common formulae exist for density, mass, volume, and area.
Yellow stands for mineral wealth. Green represents the country's vegetation and natural resources. Red recalls the blood spilt during the liberation struggle. Effective date: 18 April 1980.