Triangle Calculator.

Solve missing sides, angles, area, and perimeter of any triangle from three parameters.

Input Parameters

Side a

Side b

Side c

Angles-

Area-

Perimeter-

Comments & Feedback.

Frequently asked questions.

How is the area of a triangle calculated from three sides?

Using Heron's formula: first calculate the semi-perimeter s = (a+b+c)/2, then Area = √(s(s-a)(s-b)(s-c)). This works for any triangle when all three sides are known.

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