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As shown in the figure, AB is the chord of the smaller circle and PQ is a chord of the larger circle. PQ also touches the smaller circle at point B and BA is extended such that it touches the bigger circle at point C. Both the circles are concentric. Find the length of PQ, if CB = 50 cm and 4AB = 21CA.

As shown in the figure, AB is the chord of the smaller circle and PQ is a chord of the larger circle. PQ also touches the smaller circle at point B and BA is extended such that it touches the bigger circle at point C. Both the circles are concentric. Find the length of PQ, if CB = 50 cm and 4AB = 21CA. Correct Answer 40 cm

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