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2-Dimensional Shapes
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Symmetry
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90 degree angles
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Parallel and Perpendicular
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Quadrilaterals
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Okay guys - here we are with the first part of our next unit. This week we are going to focus on 2-dimensional shapes, which are shapes that are flat. For example, squares, rectangles, triangles, etc. are all two-dimensional shapes. There are a variety of types of 2-Dimensional shapes along with some new mathematical vocabulary that we will be working with this week.
Here are some examples of 2-Dimensional shapes with their names.
The next concept that we are going to look at this week is symmetry. This is probably something that you have heard of before. Basically, a line of symmetry is a line that cuts a shape in half so that both halves are mirror images of each other. The most common example of this is your face. Unless you have an extra nose or eye on your cheek (yikes!) your face will look almost identical on the left side and on the right side. Your face is symmetrical! Complete the short worksheet below to complete the lines of symmetry. If you don't have a printer, just draw an imaginary one with your finger, and if you can, have a family member there to help you (if you need help!).
![](http://www.weebly.com/weebly/images/file_icons/rtf.png)
Symmetry Practice | |
File Size: | 343 kb |
File Type: | docx |
So far so good with all of this geometry stuff? I hope so! The good news (at least for some of you) is that you haven't seen many numbers, and you won't see many numbers at all this week (or even next week!). The next topic I wanted to cover was about "right angles," also known as "90 degree angles." A right angle is a perfect corner angle. So look at a piece of paper, a book, or a doorframe. All of the corners have a line going perfectly horizontal (side to side), and another line going perfectly vertical (up and down). The general rule of thumb that I use is that if you can take a piece of paper and line up the corners, it is a right angle!
Looking at the practice below, I will help you with the first two questions. #1 is not a right angle, because a corner of paper would not line up with the lines. However, shape #2 is a right angle, because you could line up a corner of paper right on the lines. See how that works?
Looking at the practice below, I will help you with the first two questions. #1 is not a right angle, because a corner of paper would not line up with the lines. However, shape #2 is a right angle, because you could line up a corner of paper right on the lines. See how that works?
![](http://www.weebly.com/weebly/images/file_icons/rtf.png)
right_angles.docx | |
File Size: | 228 kb |
File Type: | docx |
Parallel lines are lines that can be extended forever, and will never ever touch each other. Think of train tracks - the two sides of a train track are parallel, and never touch each other. Sometimes, parallel lines are marked by arrows, like shown in the picture below. This is to mark that they are parallel lines.
Perpendicular lines are in a way, the opposite of parallel lines. They are two lines that DO intersect one another to form a right angle (also known as 90 degree angle). Below is an example of perpendicular lines. Notice the little box in the corners. That little box is marking a right angle. If you see it, you know that there is a right angle between those two lines (which also means those two lines are perpendicular).
For your practice on parallel and perpendicular lines, follow the link below for a few practice questions:
As quickly described in my introduction video, quadrilaterals are shapes that have exactly 4 sides. Look below for 5 examples of quadrilaterals, then complete the questions that go along with it. Once you are done, test your knowledge on everything that we have learned by practicing your skills on the second page.
![](http://www.weebly.com/weebly/images/file_icons/rtf.png)
quadrilaterals.docx | |
File Size: | 173 kb |
File Type: | docx |
![](http://www.weebly.com/weebly/images/file_icons/rtf.png)
quadrilateral questions | |
File Size: | 178 kb |
File Type: | docx |