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  • GETSenPhaseMaths display tagshide tags

    This module is included inLens: Siyavula: Mathematics (Gr. 7-9)
    By: Siyavula

    Review Status: In Review

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Symmetry and rotation

Module by: Siyavula Uploaders. E-mail the author

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?

_____________________________________________________________________

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.

Figure 1
Figure 1 (graphics1.png)
  • 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.

Figure 2
Figure 2 (graphics2.png)

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? _____________________________________________________________________

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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