Area of a triangle bounded by the coordinates of three points
Calculates the area and perimeter of a triangle defined by the coordinates of three arbitrary points.
| Area S | |
| Perimeter L |
If the area is zero, the three points lie on a straight line.
| \(\normalsize Triangle\ surrounded\ with\ three\ points\\ S=\left|{\large\frac{x_1y_2+x_2y_3+x_3y_1-y_1x_2-y_2x_3-y_3x_1}{2}}\right|\\ L=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}\\ \hspace{30px}+\sqrt{(x_2-x_3)^2+(y_2-y_3)^2}\\ \hspace{30px}+\sqrt{(x_3-x_1)^2+(y_3-y_1)^2}\\\) |
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