Angles in Convex Polygons Interactive Notebook Page

17 January 2016

My students always seem to have lots of trouble remembering how to find angles in polygons!  I created this foldable to give my students a little “cheat sheet” to help them while they work.

Angles in Convex Polygons Interactive Notebook Page - foldable with examples

At the top of the interactive notebook page, I have the definition of a polygon.  Then, I have examples and non-examples.  At the bottom of the page, I have the foldable.

Angles in Convex Polygons Interactive Notebook Page


Each tab has the formula and an example.  This foldable can be found in my Teachers pay Teachers store.

Angles in Convex Polygons Interactive Notebook Page - foldable with examples

Angles in Convex Polygons Interactive Notebook Page - foldable with examples

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Pythagorean Theorem Proof Without Words

10 January 2016

By the time my students reach me, they have already heard of the Pythagorean Theorem.  However, when I introduce right triangles, I always start with a lesson on the Pythagorean Theorem.  I find that many students don’t understand where it comes from and just take it blindly as a formula.  

I like to show my students Perigal’s Puzzle.  Basically, it is a proof without words of the Pythagorean Theorem.  First, you start with a right triangle.

A Pythagorean Theorem Proof Without Words | mrseteachesmath.blogspot.com

Then, you have the areas of each side: a^2, b^2, and c^2.  To make things easy, I will call them Square A, Square B, and Square C.

Perigal's Puzzle: A Pythagorean Theorem Proof Without Words | mrseteachesmath.blogspot.com

Perigal's Puzzle: A Pythagorean Theorem Proof Without Words | mrseteachesmath.blogspot.com

Cutting apart Square B, you can fit Squares A and B to be the same as Square C.

Perigal's Puzzle: A Pythagorean Theorem Proof Without Words | mrseteachesmath.blogspot.com

BAM!  The Pythagorean Theorem works.  

Here is a file that you can download for easy cutting :)  Also, if cutting paper isn’t your style, there is a YouTube video you can show.


Enjoy!

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Angle Pair Relationships Interactive Notebook Page

03 January 2016

Angle pair relationships is always one of the first few lessons I teach in Geometry.  It is SO important for students to understand adjacent angles and linear pairs of angles early, to help prevent misunderstandings later.

Angle Pair Relationships Interactive Notebook Page   mrseteachesmath.blgospot.com

For this interactive notebook page, I would have the students write the definition of adjacent angles at the top along with a diagram.  Sometimes, students just need to write.  Also, it gives them the chance to put the definition into their own words.

Angle Pair Relationships Interactive Notebook Page   mrseteachesmath.blgospot.com

The foldable goes underneath.  The foldable has tabs for linear pair, vertical angles, complementary angles, and supplementary angles.  Under each tab, there is the definition, a diagram, and an example.  This foldable is in my Teachers pay Teachers store.

Angle Pair Relationships Interactive Notebook Page  - Adjacent, Vertical, Complementary, and Supplementary Angles

Angle Pair Relationships Interactive Notebook Page  - Adjacent, Vertical, Complementary, and Supplementary Angles


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