Sectieoverzicht
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Some of the common shapes that you may have seen are triangles, rectangles, hexagons and squares. The name we give to these types of shapes, formed with straight lines and that can be drawn on a flat (two-dimensional) surface is polygons.
A polygon is named according to the number of sides it has, it can have three or more sides. The names are based on the prefixes of Greek numbers. In fact, you will find references to Greek numerical prefixes in many everyday objects and this can help you remember the number of sides a polygon has. For example, a decade is 10 years and a decagon has 10 sides; an octopus has eight legs and an octagon has eight sides. Can you think of other examples that use Greek numerical prefixes?
The figure below shows the different types of polygons that you may come across and examples of shapes that are not polygons.
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Leerlingen moetenAls voltooid aanduiden
Introduction to quadrilaterals
A quadrilateral is any flat, four-sided figure. Each of the four sides must be straight. A square is an example of a quadrilateral, so is a parallelogram. These are very special kinds of quadrilaterals with special properties.
The figure below shows various examples of quadrilaterals.
To learn about the properties of the special quadrilaterals watch the next video.
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