# NCERT Mathematics Class 9 Exemplar Ch 8 Quadrilaterals Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q. 11. Can all the angles of a quadrilateral be acute angles? Give reason for your answer.

Answer: No; Angle sum of a quadrilateral is

Q. 12. Can all the angles of a quadrilateral be right angles? Give reason for your answer.

Answer: Yes, Angle sum of a quadrilateral is .

Q. 13. Diagonals of a quadrilateral ABCD bisect each other. If , determine .

Answer:

Q. 14. Opposite angles of a quadrilateral ABCD are equal. If , determine CD.

Answer: