This is the basic and conceptual question from Chapter name- circles
Topic – Angle properties of circles
Chapter number- 15
In this question is given that tangents PQ and PR are drawn from an external point P to a circle such that ∠RPQ = 30°.
Also A chord RS is drawn parallel to the tangent PQ,
Now we have to find ∠RQS
ICSE Avichal publication
Understanding ICSE Mathematics
Question 20
Solution:

In the given figure,
PQ and PR are tangents to the circle with centre O drawn from P
∠RPQ = 30°
Chord RS || PQ is drawn
To find ∠RQS
∴ PQ = PR (tangents to the circle)