Mathematics
More geometry, data handling and probability
Educator section
Memorandum
5.
(a) symmetry line; symmetry axle
(b) 90 degrees
4
(c) (i) 6
(ii) 3
(iii) 2
Leaner section
Content
Activity: symmetry and rotation
5. SYMMETRY AND ROTATION
a) Refer back to the drawing at 1 b). What do we call the dotted line?
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b) Trace the following square and cut it out. Find the middle point by drawing in the diagonals. Attach your square to a piece of cardboard with a drawing pin. Make a dot in one corner of the square. Now draw the perimeter of the square on the cardboard using your pencil and a ruler.
- Rotate the dot clockwise (turn it right) to the following corner.
How many degrees has the square rotated? __________________________________
If you rotate the square 360 degrees, how many times have you turned it?
c) Do the same with the hexagon and triangle below.
i) How many times will the hexagon rotate in a full revolution? _____________________________________________________________________
ii) How many times does the triangle rotate in a full revolution? _____________________________________________________________________
iii) How many times does a rectangle rotate in a full revolution? _____________________________________________________________________