NCERT Class 9

9. In Fig.8.1, it is given that BDEF and FDCE are parallelograms. Can you say that BD = CD? Why or why not? 9. In Fig.8.1 it is given that BDEF and FDCE are parallelograms. Can you say that BD = CD? Why or why not? July 1, 2021 Category: Chapter 8 - Quadrilaterals , [...]

8. In ∆ABC, AB = 5 cm, BC = 8 cm and CA = 7 cm. If D and E are respectively the mid-points of AB and BC, determine the length of DE. 8. In ∆ABC AB = 5 cm BC = 8 cm and CA = 7 cm. If D and E are respectively [...]

7. Can all the four angles of a quadrilateral be obtuse angles? Give reason for your answer. 7. Can all the four angles of a quadrilateral be obtuse angles? Give reason for your answer. July 1, 2021 Category: Chapter 8 - Quadrilaterals , Maths , NCERT Class 9 ,

6. Diagonals of a rectangle are equal and perpendicular. Is this statement true? Give reason for your answer. 6. Diagonals of a rectangle are equal and perpendicular. Is this statement true? Give reason for your answer. July 1, 2021 Category: Chapter 8 - Quadrilaterals , Maths , NCERT Class 9 ,

5. All the angles of a quadrilateral are equal. What special name is given to this quadrilateral? 5. All the angles of a quadrilateral are equal. What special name is given to this quadrilateral? July 1, 2021 Category: Chapter 8 - Quadrilaterals , Maths , NCERT Class 9 ,

4. In quadrilateral ABCD, ∠A + ∠D = 180o. What special name can be given to this quadrilateral? ∠A + ∠D = 180o. What special name can be given to this quadrilateral? 4. In quadrilateral ABCD July 1, 2021 Category: Chapter 8 - Quadrilaterals , Maths , NCERT Class 9 ,

3. Can the angles 110^o, 80^o, 70^o and 95^o be the angles of a quadrilateral? Why or why not? 3. Can the angles 110^o 70^o and 95^o be the angles of a quadrilateral? Why or why not? 80^o July 1, 2021 Category: Chapter 8 - Quadrilaterals , Maths , NCERT Class 9 ,

2. Diagonals of a parallelogram are perpendicular to each other. Is this statement true? Give reason for your answer. 2. Diagonals of a parallelogram are perpendicular to each other. Is this statement true? Give reason for your answer. June 30, 2021 Category: Chapter 8 - Quadrilaterals , Maths , NCERT Class 9 ,

1. Diagonals AC and BD of a parallelogram ABCD intersect each other at O. If OA = 3 cm and OD = 2 cm, determine the lengths of AC and BD. 1. Diagonals AC and BD of a parallelogram ABCD intersect each other at O. If OA = 3 cm and OD = 2 cm [...]

14. D and E are the mid-points of the sides AB and AC respectively of ∆ABC. DE is produced to F. To prove that CF is equal and parallel to DA, we need an additional information which is 14. D and E are the mid-points of the sides AB and AC respectively of ∆ABC. DE [...]