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23.1... one half of a figure is identical to the other half (mirror-image)
23.2
(a);
(d)
(e)
23.4 unlimited number
23. SYMMETRY
23.1 Let us revise!
Complete: A figure is symmetrical if ______________________________________
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23.2 Which of the following figures are NOT symmetrical? Draw a big cross over each one.
c)
d)
e)
f)
23.3 Please draw in the axis of symmetry in each figure below that is symmetrical.
a)
c)
d)
e)
f)
23.4 How many axes of symmetry does a circle have? ____________________________________________________________________
23.5 Look for pictures of car emblems in newspapers and magazines. Cut them out neatly and stick them in the block below. Clearly tick those emblems that are symmetrical.
Learning Outcome 3: The learner will be able to describe and represent characteristics and relationships between two-dimensional shapes and three-dimensional objects in a variety of orientations and positions.
Assessment Standard 3.5: We know this when the learner uses transformations (rotations, reflections and translations) and symmetry to investigate (alone and/or as a member of a group or team) properties of geometric figures.
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