This is an important and exam oriented question from Chapter name- circles
Topic – Angle properties of circles
Chapter number- 15
This ques has been asked in 2008
In the ques we have a figure given and it is given that , AE and BC intersect each other at point D. If ∠CDE = 90°, AB = 5 cm, BD = 4 cm and CD = 9 cm, now we have to find DE
ICSE Avichal publication
Understanding ICSE Mathematics
Question 18
Solution: