Math
Triangle Calculator
Calculate a triangle's angles, area and perimeter from the lengths of its three sides using the law of cosines and Heron's formula.
Area
14.6969
- Perimeter18
- Angle A (opp. side a)44.42°
- Angle B (opp. side b)57.12°
- Angle C (opp. side c)78.46°
Show your work
Area = √(s(s−a)(s−b)(s−c)), s = perimeter/2
Powered by GetCalculator.online