Last
week, Mr. Piatek gave us a few worksheets that had "Coordinate
Planes". In the small booklet contained a few pages of questions, and one
where we had to design our own design.
We need
to learn how to flip the y-axis and the x-axis to find out what the mirrored
image would look like. There were things like "Lines of Symmetry". As
said in the booklet "Symmetry occurs when an object can be divided into
two identical halves that are mirror images of each other. Symmetry creates a
sense of balance and in the minds of some people perfection." Identical
halves can be reflected in vertical, horizontal, and oblique (slanted) lines of
Symmetry.
Then
theres Rotation Symmetry.
In this
method, you will be able to tell why 2-D shapes and designs have Rotation
Symmetry. There is also the Order of Rotation, and Angle of Rotation.
In order
to find out if the image has rotational symmetry, you must first find the
center of the image. If you rotate the figure about its center less than 360
degrees and it fits onto itself, then the image has rotational symmetry.
The
number of times the image fits into itself is called the Order of Rotation. The
Angle of Rotation is the minimum measure use of the angle needed to turn a
figure onto itself. To determine the angle of rotation use the following
formula:
360°
Angle of Rotation =
-------------------------------
Order of Rotation
If the image completes a rotation
of 360°, and returns to its original position, does not have any rotational
symmetry.
You can get more information about
all these things in the following videos that are provided.
