Class 9 Exam  >  Class 9 Notes  >  Lab Manuals for Class 9  >  Viva Voce: Verify that the Sum of the Angles of a Quadrilateral is 360°

Viva Voce: Verify that the Sum of the Angles of a Quadrilateral is 360° | Lab Manuals for Class 9 PDF Download

Q.1. The sum of three angles of a quadrilateral is 280°. Find the measure of the fourth angle.

Fourth angle = 360° – 280° = 80°


Q.2. In which quadrilateral(s), diagonals are perpendicular to each other?

Rhombus


Q.3. What are the conditions that any quadrilateral be a square?

  • All four sides of a quadrilateral are equal.
  • Each angle of a quadrilateral is 90°.
  • Diagonals are equal and bisect each other.


Q.4. How many vertices a quadrilateral has?

A quadrilateral has 4 vertices.


Q.5. Can all the angles of a quadrilateral be right angles? Give reason.

Yes, all the angles of a quadrilateral can be right angles, e.g. Square and rectangle.


Q.6. Is it true that parallelogram is always a trapezium but a trapezium is not always a parallelogram?

True


Q.7. Is it true that diagonals of a rhombus are equal?

No


Q.8. Is it true that every parallelogram is a rectangle?

No, only those parallelogram is a rectangle whose all angles are 90°.


Q.9. What is the angle sum property of a quadrilateral?

The sum of all angles of a quadrilateral is a complete angle, i.e. 360°.

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