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  1. A

    Circle Geo Problem (Possibly Hard, possibly easy. Argh)

    Oh I see it now. Thanks a lot.
  2. A

    Circle Geo Problem (Possibly Hard, possibly easy. Argh)

    (P'R-PP')^2 + (P'R+PP')^2 = 2r^2 I don't get this step.
  3. A

    Circle Geo Problem (Possibly Hard, possibly easy. Argh)

    I got a geometry question that looks deviously simple but alas I have not had any success. Q8 Circle Geometry in 1998 4U past paper AB is diamater of a circle. A chord RQ is drawn intersecting AB at 45 degrees at P. Prove AB^2 = 2(PQ^2+PR^2) Diagram attached.
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