Pythagoras
Fill two sides of a right triangle; the third and the area come out.
Open a calculatorTriangle area
Semi-perimeter s = (a + b + c) / 2. Area = √(s(s − a)(s − b)(s − c)). The sides must satisfy the triangle inequality. A right 3-4-5 has area 6, same as the Pythagoras page.
Area
6
Semi-perimeter
6
Area: 6
1-2-3 is a line, not a triangle. The Pythagoras page needs a right angle.
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An educational estimate. Not medical, tax or credit advice.