Selina Concise Mathematics Class 10 ICSE Solutions Circles Selina Publishers Concise Mathematics Class 10 ICSE Solutions Chapter 17 Circles Circles Exercise 17A – Selina Concise Mathematics Class 10 ICSE Solutions Circles Question 1. In the given figure, O is the centre of the circle. ∠OAB and ∠OCB are 30° and 40° respectively. Find ∠AOC. Show your steps of working. Solution: Question 2. In the given figure, ∠BAD = 65°, ∠ABD = 70°, ∠BDC = 45° (i) Prove that AC is a diameter of the circle. (ii) Find ∠ACB. Solution: Question 3. Given O is the centre of the circle and ∠AOB = 70°. Calculate the value of: (i) ∠ OCA, (ii) ∠OAC. Solution: Question 4. In each of the following figures, O is the centre of the circle. Find the values of a, b, and c. Solution: Question 5. In each of the following figures, O is the centre of the circle. Find the value of a, b, c and d. ...
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