# 1 Press Ctrl-A ©G Dear2008 – Not to be sold/Free to use Quadrilaterals Stage 6 - Year 11 Mathematic (Preliminary)

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1 Press Ctrl-A ©G Dear2008 – Not to be sold/Free to use Quadrilaterals Stage 6 - Year 11 Mathematic (Preliminary)

2 Quadrilaterals - Definition Any four sided figure

3 Quadrilaterals - Square All sides are equal length All angles are equal (90 o ) Opposite sides are parallel Diagonals bisect each other at 90 o. Diagonals bisect corners (45 o ) 45 o Square Dancing

4 Quadrilaterals - Rectangle Golden Rectangle Opposite sides - equal length All angles are equal (90 o ) Opposite sides are parallel Diagonals bisect each other Diagonals are equal in length.

5 Quadrilaterals - Rhombus All sides are equal length opposite angles are equal Opposite sides are parallel Diagonals bisect each other at 90 o. Golden Rhombus abab = 1.618 a b   

6 Quadrilaterals - Parallelogram Opposite side are equal length Opposite angles are equal Opposite sides are parallel Diagonals bisect each other    making congruent triangles

7 Quadrilateral - Trapezium One, and only one, pair of parallel sides School Desks Two Triangles Press

8 Quadrilateral - Kite Two pairs of equal adjacent sides One pairs of equal angles