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3 Quadrilaterals

Learning Objectives
After studying this chapter, students will be able to... Scan to learn
 classify polygons based on the number of sides

 define concave and convex polygons, regular and irregular polygons
 evaluate the sum of the measures of the interior and the exterior angles of a polygon
 explain the angle sum property of a quadrilateral by dividing it into two triangles
 classify quadrilaterals based on the nature of their sides or angles and describe their properties
 classify special parallelograms (rhombus, rectangle, square)
 construct unique quadrilaterals

get reAdy!

The teacher invites students to draw a few geometrical shapes on the board and interact with the class.

A B C D I am little bit confused
about shape C. How
is it a quadrilateral?
E F

Look at the figures
drawn by Amit and
identify quadrilaterals
among them.
A quadrilateral is a
4-sided polygon. So, A, B No ma’am! Figure B
and C are quadrilaterals is not a quadrilateral
because they have 4 sides. because it has
rounded corners.

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