Triangle solver

Find a triangle's remaining sides and angles — and its area — from three known values.

Solved in this browser. Nothing is sent anywhere.

Angles are entered and shown in degrees. Use the same length unit for every side; the area is in square units of the same unit. Degenerate inputs (a zero-height triangle) are rejected. The two-sides-plus-outside-angle case can legitimately have two answers.

How to use

  1. Choose which three values you know.
  2. Enter sides and/or angles.
  3. Read the solved triangle.

What it supports

Supports 3-sides, 2-sides+included-angle, 2-angles+side, and the ambiguous 2-sides+angle case (both answers shown when two exist). Angles in degrees; no spherical or right-triangle-only modes.

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