General Triangle
From sides a, b, c (SSS) computes perimeter, area (Heron), and angles via the cosine law.
Perimeter
12,00
Area
6,00
Angle A
36,87°
Angle B
53,13°
Angle C
90,00°
Area via Heron’s formula; angles from the law of cosines.
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Formula
SSS: P = a+b+c; A = √[s(s−a)(s−b)(s−c)] (Heron); angles via cosine law
Example: a = 3, b = 4, c = 5 → P = 12, A = 6, C = 90°
Methodology
Area S = (1/2) × base × height or Heron's formula from three sides. Perimeter = sum of sides.
Example
Sides 3, 4, 5: perimeter 12, area 6 (right triangle).