This is an important and exam oriented question from Chapter name- circles
Topic – Angle properties of circles
Chapter number- 15
In this question we have been given the figure of circle with certain information and we have to find the value of x in this figure.
ICSE Avichal publication
Understanding ICSE Mathematics
Question4 (a)
Solution:
(a) ABCD is cyclic Quadrilateral
∠B + ∠D = 1800
Y + 400 + 45o = 180o
(y + 85o = 180o)
Y = 180o – 85o = 95o
∠ACB = ∠ADB
xo = 40