Triangle Area Calculator |
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Enter the (x, y) coordinates of three points, and the area of the triangle they enclose will be displayed. |
If the points define a horizontal or vertical line, This is much simpler than using trigonometric functions or Heron's formula. Here is an example: The points are (0,0), (5,4), and (8,2). The three right triangles have areas of (5*4)/2 = 10, (2*3)/2 = 3, and (8*2)/2 = 8. Those total 21, which when subtracted from the enclosing 4 * 8 = 32 rectangle, leaves an area of 11 for the given triangle. |