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Viva Voce: Quadrilateral Formed by Joining Mid-points of Sides of a Quadrilateral | Lab Manuals for Class 9 PDF Download

Q.1. What are two main properties of a quadrilateral?

  • Sum of four angles is 360°.
  • It has 4 sides.


Q.2. Write two main properties of a parallelogram.

  • Diagonals bisect each other.
  • Opposite sides are equal.


Q.3. Do you know any difference between a parallelogram and a trapezium?

In a parallelogram, two pairs of opposite sides are parallel. In a trapezium, one pair of opposite sides is parallel.


Q.4. If base and altitude of a parallelogram are same, then what will be area of parallelogram?

Base x altitude


Q.5. What do you mean by a parallelogram?

A parallelogram is a quadrilateral in which opposite sides are equal and parallel.


Q.6. If you join the mid-points of consecutive sides of a quadrilateral, what shape will you obtain?

Parallelogram


Q.7. If you join the mid-points of consecutive sides of a rectangle, what figure will you obtain?

Rhombus


Q.8. If you join the mid-points of consecutive sides of a rhombus, what figure will you obtain?

Rectangle


Q.9. Which theorem is used in this activity?

Mid-point theorem


Q.10. Write the name of different kinds of parallelograms.

Rectangle, square and rhombus.


Q.11. If base and altitude of a parallelogram are same, then what type of parallelogram will be obtained?

Square


Q.12. What is the area of a parallelogram?

Base x corresponding altitude


Q.13. In a parallelogram, if one angle is 90°, then what type of parallelogram you will get?

Rectangle


Q.14. Is a parallelogram a quadrilateral?

Yes


Q.15. What do you mean by a quadrilateral?

A quadrilateral is a plane closed figure bounded by four line segments.

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