The Area of a Triangle from Length of Three Sides calculator computes the area of a triangle given the length of the triangle's three sides using Heron's formula.
INSTRUCTIONS: Choose units and enter the following:
(a) Length of Side a
(b) Length of Side b
(c) Length of Side c
Area (A): The calculator returns the area in square meters (m2). However, this can be automatically converted to other area units (e.g. square feet) via the pull-down menu.
The calculator makes a check that no one side is greater than the sum of the other two. In that case, it is impossible to have a triangle.
A triangle is a polygon with three sides, three vertices (corners), and three angles. Triangles can be classified based on the lengths of their sides and the measures of their angles as follows:
By Side Lengths:
Equilateral Triangle: All three sides are equal in length.
Isosceles Triangle: Two sides are equal in length.
Scalene Triangle: All three sides have different lengths.
By Angle Measures:
Acute Triangle: All three angles are less than 90 degrees.
Right Triangle: One angle is exactly 90 degrees.
Obtuse Triangle: One angle is greater than 90 degrees.
The sum of the interior angles of any triangle always adds up to 180 degrees.