In this video we learn the most tough topic for students in easy manner or using trick. after watching this video compound interest is very easy for every students.

In fig., a quadrilateral abcd is drawn to circumscribe a circle, with centre o, in such a way that the sides ab, bc, cd and da touch the circle at the points p, q, r and s respectively.
prove that: ab+ cd = bc + da.

Let p and q be the points of trisection of the line segment joining the points a(2, – 2) and b(– 7, 4) such that p is nearer to a. find the coordinates of p and q.

Given the linear equation x – 2y – 6 = 0, write another linear equation in these two variables, such that the geometrical representation of the pair so formed is :
i) coincident lines (ii) intersection lines

In the given figure, pa and pb are tangents to the circle from an external point p. cd is another tangent touching the circle at q. if pa = 12 cm, qc= qd = 3 cm, then find pc + pd.

25. prove that tangents drawn at the ends of a diameter of a circle are parallel to each other.
26. find the value of k for which the equation x2 + k(2x+ k – 1) + 2 = 0 has real and equal roots.

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