One of the most important and exam oriented question from Chapter name- circles
Topic – Angle properties of circles
Chapter number- 15

It is given that the sides of the quadrilateral touch the circle.

And we have to. Prove that AB + CD = BC + DA

In second part we have that ABC is triangle with AB = 10cm, BC = 8cm and AC = 6cm (not drawn to scale).

Also three circles are drawn touching each other with vertices A, B and C as their centres. Now we have to find the radii of the three circles

ICSE Avichal publication
Understanding ICSE Mathematics
Question 11