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Properties Of 2D Polygons
Objectives
To increase mathematical vocabulary with an understanding of the terms parallel and perpendicular.
Resources
Abacus 4 Textbook 2 | Scanner or copier | Coloured pencils
Today's Lesson
Main Activity
Watch the video 'Parallel and Perpendicular' to understand the difference between parallel and perpendicular lines.
Look at or draw a few 2D shapes with straight sides, using a ruler. Make sure some have parallel lines. Parallel lines are straight lines that are always the same distance apart; they will never meet. Draw attention to the parallel lines and ask your student to think of some places where they may have seen parallel lines, for example, railway tracks, roads, canals and so on.
One way to remember the meaning (and spelling!) of the word is that it contains two ‘-ls’ which are parallel.
Now, draw attention to where two lines meet at a point to form a right angle. We call these perpendicular lines.
Turn to page 33 in Abacus 4 Textbook 2.
Scan or copy the page, so that your student can write directly on the paper. Ask your student to identify the shapes with parallel and/or perpendicular lines. It would be a good idea to ask your student to use a coloured pencil to show the parallel lines in each shape. Point out that not every parallel line is the same length as its opposite parallel and that some shapes have more than one pair of parallel lines, e.g. a regular hexagon has three pairs of parallel lines.