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Guys pls help me out with the second question

Please find below the link of similar query as asked by you :

1 ) https://www.meritnation.com/ask-answer/question/distance-of-a-chord-ab-of-a-circle-from-the-center-is-12cm-a/circles/7173895

2 ) https://www.meritnation.com/ask-answer/question/the-diameter-of-the-given-circle-is-10-cm-and-pq-1-cm-fin/circles/10743319

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Hello Julia, for the first one OL is the perpendicular bisector of  AB
AB = 10 cm. So AL = 5 cm
OL = 12 cm
In right triangle O A^2 = AL^2 + OL^2 = 5^2 + 12^2 = 13^2
So radius OA = 13 cm 
For second one, OQ = 10/2 = 5 cm
As PQ = 1 cm, then OP = 5 - 1 = 4 cm
In right triangle, OR = 5 cm, OP = 4 cm
So RP^2 = OR^2 - OP^2 = 5^2 - 4^2 = 3^2
Thus RP = 3 cm
Hence RS = 2 * RP = 2 * 3 = 6 cm
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