Triangle Calculator

Calculate area, perimeter, angles, and properties of any triangle.

Enter the sides

Side A

Side B

Side C

Area

14.70

square units

Perimeter

0,00

Inradius

0,0000

By Sides

Scalene

By Angles

Acute

α (A)

44.4°

β (B)

57.1°

γ (C)

78.5°

Sum of Angles: 180.0°

5.88

4.90

4.20

A triangle is a three-sided polygon with three angles. The sum of its interior angles is always 180°.

By sides: Equilateral (3 equal), Isosceles (2 equal), Scalene (all different). By angles: Acute, Right, Obtuse.

Area = (base × height) / 2. Heron's formula can also be used when all three sides are known.