AAA Triangle Calculator

Your details

Interior angle opposite side a, in degrees.
deg
Interior angle opposite side b, in degrees.
deg
Interior angle opposite side c, in degrees. Must equal 180 minus A minus B.
deg
Provide one side to compute actual lengths, area, and perimeter.
Length of the known side in any consistent unit.
units
Angle sumAcute triangle
180deg

Must equal exactly 180 for a valid triangle.

Relative side a1.3473
Relative side b1.5321
Relative side c1
Triangle typeAcute Scalene

Valid triangle - angles sum to 180 degrees.

  • Your triangle is acute scalene: angles are 60, 80, and 40 degrees.
  • The sides are in the ratio a : b : c = 1.347 : 1.532 : 1.000, derived from the Law of Sines.
  • Three angles alone fix the shape but not the scale - infinitely many similar triangles share these angles. Provide one side length to calculate actual dimensions.

Next stepSelect a known side from the dropdown to unlock area, perimeter, and exact side lengths.

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