9. 2-D Shapes 1 Talk About


Have a look around your classroom. Name and fi nd examples of as many 2-D shapes as possible.


What shape is the whiteboard, pane of glass in the window and your tabletop? What is the most common 2-D shape in the classroom? Why do you think this is so?


Remember: two-dimensional (2-D) shapes are so called because they have only 2 dimensions: length and width.


Properties of 2-D Shapes


1. Identify these 2-D shapes and describe the shapes using the following headings: number of lines, number of angles, parallel lines, equal length, perpendicular lines, right angles, acute angles, obtuse angles.


2. Make each of the above shapes either on a geoboard or using lollipop sticks.


3. a) Discuss the following: quadruple, the Pentagon (Washington, DC), hexagonal, octave (music), decathlon.


b) What number forms part of each word? (e.g. quad = 4, penta = ?) c) Can you count up from 5 to 10 using the Greek prefi xes: penta, hexa, …


Remember: 2-D shapes that have the same number of sides and angles are called polygons.


A regular polygon is a polygon with sides of the same length, and with angles that are all the same.


Strand: Shape and Space 66


Curriculum Objectives: Make informal deductions about 2-D shapes and their properties; use angle and line properties to classify and describe triangles and quadrilaterals;


construct triangles from given sides or angles; use 2-D shapes and properties to solve problems.


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