Triangle Calculator

Area and properties of a triangle from three sides.

Result

Area14.6969
Perimeter18
Angles A / B / C44.42° / 57.12° / 78.46°
TypeScalene

Triangle Calculator — FAQs

Heron's formula?

Area = √(s(s−a)(s−b)(s−c)) where s is the semi-perimeter — works for any triangle given all three sides.

Triangle area formula?

½ × base × height, or Heron's formula √(s(s−a)(s−b)(s−c)) where s is the semi-perimeter when you know all three sides.

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Free to use — paste this snippet into any webpage. It auto-resizes and includes a small attribution link. Add ?theme=dark to the iframe URL for dark mode.