 Hello and welcome to the session. In this session we discussed the following question which says in the given figure prove that a a dash is equal to b v dash. First we shall recall one fact which says that the lengths of tangents drawn from an external point to a circle are equal. This is the key idea that we use in this question. Let's move on to the solution now. This is the figure given to us and we have to show that a a dash is equal to b b dash. First of all we produce a a dash and b b dash to meet each other at point p. So we have produced a a dash and b b dash to meet at point p. Now we have p a is equal to p b as the tangents drawn from the point p. Also we have p a dash is equal to p b dash as there also tangents drawn from the point p. Now p a minus p a dash is equal to p b minus p b dash. Now from the figure p a minus p a dash is equal to a a dash and this is equal to p b minus p b dash which is b b dash. So thus we get a a dash is equal to b b dash hence proved. This completes the session. Hope you have understood the solution of this question.