Introduction to quadrilaterals

Objectives

 * To make quadrilateral
 * Measure sides – segment lengths
 * Measure interior angles and find their sum
 * Measure length of diagonals and angle between diagonals

Estimated Time
30 minutes

Prerequisites/Instructions, prior preparations, if any
Prior knowledge of point, lines, angles, intersecting lines, vertically opposite angles

Materials/ Resources needed

 * Digital : Computer, geogebra application, projector.
 * Non digital : worksheet and pencil.
 * Geogebra files : 'Introduction to quadrilaterals.ggb'

Process (How to do the activity)
Evaluation at the end of the activity
 * What is a quadrilateral? How many line segments are required for a  quadrilateral. What are these line segments called?
 * How many vertices in a quadrilateral? How many interior angles ?
 * How many lines can be drawn such that they join opposite vertices in a  quadrilateral?What are these lines called?
 * Do the two lines intersect with each other? At the point of  intersection how many angles are formed?Do you notice any equal  angles? What kinds of angle pairs are formed at the point of  intersection?
 * What is the measure of the total angle at the point of intersection of diagonals?
 * Can the vertices of a quadrilateral be anywhere on a plane?
 * Can the vertices of a quadrilateral lie on a straight line?