Triangle Length Calculator

Your details

Pick the combination of values you already know. Side labels a, b, c are opposite to angles A, B, C respectively.
All side lengths are in this unit; angles are always in degrees.
Side a is opposite angle A.
m
Side b is opposite angle B.
m
Side c is opposite angle C.
m
Side a
5m

Length of side a (opposite angle A)

Side b6m
Side c7m
Angle A44.4153deg
Angle B57.1217deg
Angle C78.463deg
Area14.6969m²
Perimeter18m
Inradius (r)1.633m
Circumradius (R)3.5722m

Triangle solved: sides 5.000, 6.000, 7.000 m

  • This is a acute (all angles less than 90 degrees) triangle and scalene (all sides different).
  • Perimeter: 18.0000 m. Area: 14.6969 m².
  • The longest side is 7.0000 m (opposite the largest angle 78.46°).

Next stepUse the step-by-step panel to verify every calculation. For navigation or surveying, also check the altitude values using Area = 0.5 * base * height.

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