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starMay 2013

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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 the Geometry ebook that I sell at MathMammoth.com. This lesson plan does not contain all the problems the Geometry ebook does.


Equilateral and isosceles triangles
Free geometry lesson plan from HomeschoolMath.net

A triangle whose all sides are equal is called
an equilateral triangle. "Equi" refers to
something same or equal; "lateral" refers to
sides.  Think of it as the "same-sided triangle".
      A triangle where at least two sides are
equal (and even the third can be) is called
an isosceles triangle.  Think of it as the
"same-legged triangle", the legs being the
two sides that are are the same.


    


Example problem types

1.  Draw an isosceles triangle (a triangle that has two equal sides).  Start out by drawing the two sides that have equal measure and draw the third side last.  Use a ruler to make sure they are equal.

2.   Make a guess about the angles in an equilateral triangle: ______________ 
Then measure the angles in the equilateral triangles above.  What do you notice?  
ALL the angles are _______ degrees.
Based on that fact, draw an equilateral triangle.  You can choose the length of the sides.

                        

An isosceles triangle has two angles that have the same measure. 
They are called the base angles,  The remaining angle is called the top angle.

4.  a) Draw an isosceles triangle whose base angles are 40.  What is the top angle?  The length of the sides can be any.
     b) Draw an isosceles triangle whose base angles are 75.  What is the top angle?  Again the length of the sides can be any.

6.  a)  Is it possible to have an equilateral right triangle?  Why?  If so, draw one.
     b)  Is it possible to have an equilateral obtuse triangle? Why?  If so, draw one.
     f)  Is it possible to have an isosceles acute triangle? Why?  If so, draw one.
     

7. Calculate the angles.  Don't measure, because the pictures are not exact.  Note especially if the triangle(s) are equilateral or isosceles.

[Pictures available in the ebook]

 

New terms to remember:

  • an equilateral triangle
  • an isosceles triangle 
  • base angles
  • top angle

Next geometry lesson

Hooda Math

Practice makes perfect. Practice math at IXL.com

Free math worksheets and practice - Adapted Mind


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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