Enter the three side lengths and the solver returns the area, perimeter, all three interior angles and whether it is scalene, isosceles or equilateral.
Side-Side-Side: given all three side lengths, the calculator determines the angles, area, perimeter and classification.
With Heron's formula: area = √(s(s−a)(s−b)(s−c)), where s is the semi-perimeter (a+b+c)/2.
Using the law of cosines, e.g. cos(A) = (b²+c²−a²)/(2bc), for each of the three interior angles.