Why do I need at least one side?

Three angles alone fix the shape but not the size — without a side length the triangle could be scaled to any size, so a side is required.

Triangle Calculator

Solve any triangle from three known values (SSS, SAS, ASA, AAS, or SSA) to find all sides, angles, area, perimeter, and the triangle’s type.

Why do I need at least one side?: Three angles alone fix the shape but not the size — without a side length the triangle could be scaled to any size, so a side is required.

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