# NCERT Mathematics Class 9 Exemplar Ch 10 Circles Part 3

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8. ABCD is a cyclic quadrilateral such that AB is a diameter of the circle circumscribing it and, then is equal to:

(A)

(B)

(C)

(D)

Answer: B

9. In Fig. 10.8, BC is a diameter of the circle and Then is equal to:

(A)

(B)

(C)

(D)

Answer: C

10. In Fig. 10.9, and, then is equal to:

(A)

(B)

(C)

(D)

Answer: D