Online triangle calculator: compute the area, perimeter and interior angles from three sides (SSS) or two sides and the included angle (SAS), based on Heron's formula and the law of cosines—great for geometry study and engineering calculations.
Uses Heron's formula for the area in SSS mode and the two-sides-and-included-angle formula in SAS mode. Angles are kept to two decimal places and computed only on your machine.
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Create a short link so you can reopen or download the result on other devices.