Geometry week 3

 We moved on from pyramids and prisms to cylinders and cones. Cones have a circular base and all the line segments meet at the apex. Cylinders on the other hand have two parallel curved bases and all line segments attach to the base. however, cones and cylinders can also be right or oblique just like pyramids and prisms depending on the angle in which the line segments meet the base.
Here is a picture of  standard cones, cylinders, pyramids and prisms just to refresh your memory and put some pictures to the descriptions:

This week was a frustrating one for me. I have a really hard time understanding translations, rotations, reflections and glide reflections. The definitions are as follows
Translation(aka slide) is the rigid motion in which all points of the plane are moved the same distance in the same direction.
Rotation(aka turn) is another basic rigid motion, one point of the plane called the turn center or center of rotation is held fixed, and the remaining points are turned about the center of rotation through the same number of degrees- the turn angle or angle of rotation.
Reflection(aka flip)is another basic rigid motion. The motion is determined by a line in the plane called the line of reflections or the mirror line.
Glide Reflection is the last basic rigid motion, this is a combination of a slide and a reflection. The line of reflection is called the glide mirror and it must be parallel to the direction of the slide. The slide is usually called a glide and its vector is called the glide vector or glide arrow.
The definitions sound like a bunch of mumbo jumbo but arent important to know so you have a geometry vocabulary and can refer to remember the differences in the movements. This aspect of geometry has always been the hardest for me but this youtube video helped a lot  because it applied it to real life when this information would be useful and gave me a picture in my head to think of when trying to remember what each term meant and I hope it does the same for you!
http://www.youtube.com/watch?v=dVtz55mIuz4