British Flag Theorem
The British flag theorem says that if a point P is chosen inside rectangle ABCD then . The theorem is called the British flag theorem due to the similarities between the British flag and a diagram of the points (shown below):
The theorem also applies if the point is selected outside or on the boundary of the rectangle, although the proof is harder to visualize in this case.
In Figure 1, by the Pythagorean theorem, we have:
This article is a stub. Help us out by.