One of the most important and exam oriented question from Chapter name- circles

Topic – Angle properties of circles

Chapter number- 15

We have been given that quadrilateral is circumscribed; we have find the perimeter of quadrilateral .

B) in figure (ii) given below, quadrilateral ABCD is circumscribed and AD ⊥ DC ; we have to find x if radius of incircle is 10 cm.

ICSE Avichal publication

Understanding ICSE Mathematics

Question 7

Solution:(a) From A, AP and AS are the tangents to the circle

∴AS = AP = 6

From B, BP and BQ are the tangents

∴BQ = BP = 5

From C, CQ and CR are the tangents