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unit of measure: the base unit | the supplementary unit | the derived unit

*geometry: the area of a flat figure | the area of a solid | the volume of the solid*

The ** equilateral triangle** is a variety of scalene and isosceles triangle, which is characterized by the congruence (equality) of all its sides and angles.

The ** area of equilateral triangle ** by side, is determined by a modified version of the formula for right triangle – half product of the base and its height, deducted by one of congruent sides as hypotenuse.

where:

a — the side of triangle.

*For separation of number integers and decimals, use the symbol – point [.]*

context information: contemporary and archaic unit of measurement of area