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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.


Circles
Free geometry lesson plan from HomeschoolMath.net

What is a circle?  Discuss with your teacher.

 

 

Everybody knows
these are NOT
circles. But why?
These figures have round
shapes, but they are not
circles either.  What in them
is different from circles?
These are ovals, and they are
real smoothly round but still
not circles.
So what makes a real circle?

 

There is a special point inside a circle called the center point.
The circle line is called the circumference.

All the points on the circumference are AT THE SAME
DISTANCE from the center point.  That is the definition of a
circle: All the points that are at the same distance from a given
point (center point) constitute a circle.

This distance from
the center point to
any point on the
circumference is
called the radius.
A line that crosses
the circle and goes
through the center
point is called a
diameter.


Example problem types

1.  Draw a radius/diameter from the given point.  Look at the example.

   

   

Here a radius is drawn
from the given point.
a)  Draw a radius from
the given point

b)  Draw a radius from 
each of the given points. 

2.  Practice drawing circles with your compass.  Draw a circle with a 1 inch radius, with 5 cm radius, with 3 cm radius, with 1/2 inch radius.

3.   How does the radius of the circles relate to the radius of the other circles in the pictures?  
Practice drawing the figures in your notebook using compass and ruler only.

 a)               b) 

Hint:  You will need to make use of the center point of the circles, so mark them down on
paper after you have drawn any circles.  The circles can be bigger or smaller as you choose. The important thing is to make the pictures look the same.

 

5.  Draw a line and then two points on the line.  

Then draw a circle using one point as a center point and the other point as a marking the radius.  In other words, use the distance between the two points as the radius.  Now draw another circle using the second point as the center point and the first point as indicating the radius.
Look at the picture.

a)  Now draw a line through the points where the two circles intersect.  What do you notice?

b)  If you connect the two initial points to the point above them where the two circles intersect (cross), what kind of figure do you get?

 
7.  Draw an equilateral triangle with the compass and ruler only (don't use the protractor).  You can choose the length of the side.  Hint:  the idea is the same as in problem 6.

 

 

New terms to remember:

  • circle
  • circumference
  • radius
  • diameter

Next geometry lesson

          

Practice makes perfect. Practice math at IXL.com

Free math worksheets and practice - Adapted Mind

Still looking for the right homeschooling solution? Find a better option today.


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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