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Law of Sines & Cosines Calculator

Solve any triangle — pick what you know (SSS, SAS, ASA, AAS, or SSA) and get every side and angle, the area, perimeter, a scaled diagram, and full step-by-step working.

Sides a, b, c are opposite angles A, B, C. Angles in degrees.
a b c

Enter all three side lengths. Sides must satisfy the triangle inequality.

Results

Solved triangle
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Side a
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Side b
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Side c
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Angle A
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Angle B
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Angle C
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Area
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Perimeter
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Triangle diagram

TriangleVertices A, B, CGiven parts

Step-by-step