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- 1. QUADILATRERA LS
- 2. What are quadilaterals? A quadrilateral is a polygon with four sides (or 'edges') and four vertices or corners.
- 3. WHAT ARE POLYGONS? In geometry a polygon is traditionally a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments (i.e., by a closed polygonal chain ). These segments are called its edges or sides, and the points where two edges meet are the polygon's vertices (singular: vertex) or corners.
- 4. HOW IS A QUADRILATERAL A POLYGON? A quadrilateral is a polygon. In fact it is a 4-sided polygon, just like a triangle is a 3-sided polygon, a pentagon is a 5-sided polygon, and so on.
- 5. QUAD means four And LATERAL means sides
- 6. A line segment drawn from one vertex of a quadrilateral to the opposite vertex is called a diagonal of the quadrilateral. AC is a diagonal of quadrilateral ABCD, as is BD.
- 7. TYPES OF QUADILATERALS There are seven types of quadrilaterals that can be divided into two groups: parallelograms and other quadrilaterals. Rectangle Trapezium Rhombus Square Parallelogram
- 8. • PARALLELOGRAMQuadrilaterals are called parallelograms if both pairs of opposite sides are equal and parallel to each other. • OTHER QUADRILATERALSOther quadrilaterals include trapeziums, kites and irregular quadrilaterals
- 9. IRREGULAR QUADILATERALS An irregular quadrilateral does not have any special properties.
- 10. COMPLEX QUADILATERALS When two sides cross over, you call it a "Complex" or "Self-Intersecting" quadrilateral like these: They still have 4 sides, but two sides cross over.
- 11. ANGLE SUM OF A QUADILATRAL Draw a quadrilateral ABCD. Then draw the diagonal AC to form two triangles.
- 12. FINDING THE FOURTH ANGLE OF A QUADRILATERAL If the measurements of three angles of a quadrilateral are known, then the missing angle can be calculated
- 13. ExampleFind the value of the pronumeral x in the accompanying diagram. Give reasons for your answer.
- 14. Solution:
- 15. OTHER NAMES A quadrilateral can sometimes be called: • A Quadrangle ("four angles"), so it sounds like "triangle" • A Tetragon ("four and polygon"), so it sounds like "pentagon", "hexagon", etc.
- 16. END OF THE PRESENTATION

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