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In the figure, PT, PS are tangents to th...

In the figure, PT, PS are tangents to the large circle and small circle respectively. The circle cut each,other at points 'A' and B. If 'P B=4 cm, AB=5 cm'
'(##VPU_TTT_MAT_X_P02_C07_E16_003_Q01##)'
a) Find the length of PA.
b) Calculate the lengths of PS ànd PT.

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