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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 area of a triangle

by two sides and the angle between them


A triangle is a polygon formed by the union of three segments, where the points of intersection are non-collinear points. Points of intersection are called vertexes, and the segments are referred to as sides.

The scalene triangle is the triangle which has all sides of different lengths.

The area of a triangle, in case there are known two sides and the angle formed by them (in degrees), is equal to semi-product of the sides and sine of the angle formed by them.

Computing relationship:


a, b — the sides of triangle;

γ — the angle formed by the sides a and b, 0.

Calculator: the area of a triangle

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

the side of triangle — a

the side of triangle — b

the angle formed by the sides — γ



the area of a triangle =



context information: contemporary and archaic unit of measurement of area