# NCERT Mathematics Class 9 Exemplar Ch 10 Circles Part 6

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Q.16. In Fig.10.14, Find.

Answer:

Q.17. A quadrilateral ABCD is inscribed in a circle such that AB is a diameter and Find.

Answer:

Q.18. Two circles with centres O and O′ intersect at two points A and B. A line PQ is drawn parallel to OO′ through A (or B) intersecting the circles at P and Q. Prove that

Q.19. In Fig.10.15, AOB is a diameter of the circle and C, D, E are any three points on the semi-circle. Find the value of

Answer:

Q.20. In Fig. 10.16, and Find and.

Answer: ,