Properties of quadrilaterals and the interior and exterior angles of quadrilaterals

What you need to learn in this topic

1. Describe the geometric properties of various types of quadrilaterals. Hence classify quadrilaterals based on the geometric properties.
2. Make and verify the conjectures about (i) the sum of interior angles of a quadrilateral, (ii) the sum of interior angle and adjacent exterior angle of a quadrilateral, and (iii) the relationship between the opposite angles in a parallelogram.
3. Solve problems involving quadrilaterals.
4. Solve problems involving the combinations of triangles and quadrilaterals.