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starMay 2013

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Google+ Latest from my blog
This is where you'll find the latest happenings, news, & ideas in math teaching

Math teaching videos
My videos at YouTube show you how to teach concepts.
How to help students with multiplication tables?


Worksheets
Various worksheets on TONS of math topics you can generate for free!

Basic operations worksheet generator is updated! Make worksheets for whole numbers or integers - all four operations, including add & subtract or multiply & divide - horizontal or vertical - add a border and/or extra workspace, use a variable, and more.

Curriculum
Advice, reviews, and resources to help you choose a math curriculum!

Online math games, tutorials, and activities
Games you can play online, interactive tutorials, fun math websites and more. Arranged by topic/level for ease of use.

Lessons
Learn how to TEACH concepts or about general concerns in math education.

Reviews
In-depth reviews of math products

Math help & tutoring
A list of free message boards, math help websites, and online tutoring services.

Fun and games
I have two games on my site, plus links to many.
Game: Choose Math Operation
Word guess game (easy hangman)
Word guess game (difficult)


The ideas in this geometry lesson are taken from Math Mammoth Geometry 1 book that I sell at MathMammoth.com. This lesson plan does not contain all the problems included in the Geometry book.


Line Symmetry
Free geometry lesson plan from HomeschoolMath.net

These figures are symmetrical in relation to the dashed line.
The line is called a symmetry line.

This means that one half of the figure
is the mirror image of the other half.

              

Imagine that you folded the figure along the symmetry line.  Then both sides would exactly meet.
Or, place a mirror along the symmetry line. You see the other half of the figure reflected in the mirror.

Some shapes you can fold two different ways
so that the sides meet. The cross-shape
on the right has two different symmetry lines.
          
Look at this flower shape.
It has four different symmetry lines.

Check them by using the mirror.

 
Any line that you draw through the circle's
center point is a symmetry line.

So, we can't even count how many symmetry
lines a circle has! Draw you one more example
in the last circle.

      
Some shapes have only
one symmetry line,
like this arrow shape.
Many figures are not symmetrical at all.    

1. Are these figures symmetrical? Draw a symmetry line to those that are.
    You can also cut them out and fold them to check.

a. b. c. d. e.
 

The case of the parallelogram

Does a parallelogram have a symmetry line like this?
Use a mirror to check! Or, draw a parallelogram, cut it out,
and fold it along the diagonal line. Do the two folded sides match?

Here's the answer: The red dotted line shows you how
the folding would go. The two sides don't match, so
the blue dashed line is NOT a symmetry line.
   

2. Is the line drawn a symmetry line for the figure?

a. b. c. d.  e. f. 

3. Draw different symmetry lines to these figures.

a. 

b.  

c.  

d.   

4. Write the capital letters to which you can draw a symmetry line. Draw the symmetry lines to them.

 

 

 

Next geometry lesson

Practice makes perfect. Practice math at IXL.com

Free online math games and more - www.mathnook.com

Practice makes perfect. Practice math at IXL.com


New! Times Tales is now on DVD!

The fast, FUN, and easy way to learn multiplication. Learn the upper times tales in two sittings using mnemonic stories.
 
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