This is circle based question from Chapter name- circles
Topic – Angle properties of circles
Chapter number- 15
In the figure given in question , PQ is a tangent to the circle at A, DB is a diameter, ∠ADB = 30° and ∠CBD = 60°,
Now we have to calculate (i) ∠QAB (ii) ∠PAD (iii) ∠CDB.
ICSE Avichal publication
Understanding ICSE Mathematics
Question no 21(a)