The video tutorial explains the concept of quadrilaterals, which are four-sided figures with four vertices and angles. It covers the naming of vertices and sides, properties of quadrilaterals on a plane, and the formation and naming of angles. The tutorial also discusses diagonals, which connect opposite vertices, and their practical applications, such as measuring screen sizes. The video emphasizes that quadrilaterals are closed figures lying on a single plane.

What does the term 'quadri' in quadrilateral signify?

• Six

• Four

• Three

• Five

Which of the following is NOT an example of a quadrilateral?

• Circle

• Envelope

• Television screen

• Canvas

How many vertices does a quadrilateral have?

• Two

• Three

• Four

• Five

What is the term used for the points A, B, C, and D in a quadrilateral?

• Diagonals

• Edges

• Vertices

• Angles

What is a key property of a quadrilateral regarding its sides and vertices?

• It has three sides and three vertices

• It is an open figure

• It is a circular figure

• It has four sides and four vertices

What is formed when two sides of a quadrilateral meet?

• An edge

• A diagonal

• A vertex

• A plane

How many angles are there in a quadrilateral?

• Four

• Three

• Five

• Two

How can angle DAB in a quadrilateral also be named?

• Angle BAD

• Angle ABC

• Angle BCD

• Angle CDA

Which of the following is a correct way to name an angle in a quadrilateral?

• Angle A

• Angle BCD

• Angle D

• Angle E

What are the lines called that join opposite vertices in a quadrilateral?

• Vertices

• Edges

• Diagonals

• Angles