11.2: Quadrilaterals

1) Lesson Objectives:

You should be able to

• know angle sum of quadrilaterals

• know properties of special quadrilaterals

Terminologies

• Square

• Rectangles

• Parallelogram

• Rhombus

• Trapezium

• Kite

• Diagonals

• Vertex / vertices

• Non-adjacent vertices

• Interior angles

• Exterior angles

Properties of angles in triangles:

• Angle sum of quadrilaterals

A: Angle sum of quadrilateral

Fill in the blanks (grey coloured box) in the Thinking Time for pg 106.

B: Properties of special quadrilaterals

Read and try to understand Textbook 1B explanations and worked examples: pg 106 to 111.

Fill in the blanks (grey coloured box) in the table for pg 107 to 108.

Properties of parallelogram:

• 2 pairs of parallel sides

• opposite sides are equal

• opposite angles area equal

Types of parallelogram:

• Parallelogram

• Rhombus

• Rectangles

• Squares