Question: 5. A circle has centre O and diameter AB = 2v19. Points C and D are on the upper half of the circle. A line

5. A circle has centre O and diameter AB = 2v19. Points C and D are on the upper half of the circle. A line is drawn De through C and D, as shown. Points P and Q are on the PC R line so that AP and BQ are both perpendicular to PQ. QB intersects the circle at R. If CP = DQ = 1 and 2AP = BQ, A B what is the length of AP? O
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