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In the figure, 'A B' is a diameter of th...

In the figure, 'A B' is a diameter of the circle and the chord 'C D' is perpendicular to 'A B .' If 'C D=4 sqrt5' centimetres and PA = 2 centimetres, find 'A B'.
'(##VPU_TTT_MAT_X_P01_C02_E09_001_Q01##)'

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