Calculate angles from side lengths
Calculator and formula for calculating the angles angles from side lengths a, b, c
With this calculator the angles of a triangle are calculated from the side lengths a, b and c
Enter the lengths of the 3 sides, then click the 'Calculate' button.
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Formulas for calculation of angles
Angle α
\(\displaystyle α = acos\left(\frac{b^2+c^2-a^2}{2bc} \right)\)
Angle β
\(\displaystyle β = acos\left(\frac{a^2+c^2-b^2}{2ac} \right)\)
Angle γ
\(\displaystyle γ = acos\left(\frac{a^2+b^2-c^2}{2ab} \right)\)
Angle functions
From Deg, Min, Sec to Decimal • From Degree to Percent • Angle sum • Side lengths from anglesCircular functions
Annulus • Annulus sector • Circle • Circular angles • Circular arcs • Circular sector • Circular segment • Ellipse • Parabolic arch • Squaring the Circle