British flag theorem British flag theorem In Euclidean geometry, the British flag theorem says that if a point "P" is chosen inside rectangle "ABCD" then the sum of the squared Euclidean distances from "P" to two opposite corners of the rectangle equals the sum to the other two opposite corners. As an equation: The theorem also applies to points outside the rectangle, and more generally to the distances from a point in Euclidean space to the corners of a rectangle embedded into the space. Even more generally, if the sums of squared distances from a point "P" to the two pairs of opposite
The Witch's Familiar also believed having Davros open his eyes "a particularly brilliant touch" and went on to praise the moment as "insightfully written, beautifully shot, and brilliantly acted". The Witch's Familiar "The Witch's Familiar" is the second episode of the ninth series of the British science fiction television series "Doctor Who". It was first broadcast on BBC One on 26 September 2015. It is written by Steven Moffat and directed by Hettie MacDonald. It is the second part of the story, following "The Magician's Apprentice". In the pair of episodes, alien time traveller the Doctor (Peter Capaldi) battles his old enemies the