Blog

My books!

Newsletter

Worksheets

Lessons

Videos

Online math resources

Reviews

Curriculum guide

Maria's Math news - a FREE math newsletter for parents and teachers

May 2013

Subscribe below:

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.

(easy hangman)
(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.

Parallel and perpendicular lines
Free geometry lesson plan from HomeschoolMath.net

Two lines or line segments can either intersect (cross) each other or be parallel.
Think of the parallel lines as never meeting each other, no matter how much you would continue them to both directions.

These lines intersect.

These lines are parallel.

What about these lines? Do they
intersect or are they parallel?
Try continuing the lines with your
ruler and see what happens.

These lines intersect and form four right
angles. They are perpendicular lines.

The little symbol ("corner") is used
to indicate a right angle.

We already know that two lines that intersect form two pairs of vertical angles. What happens if you have three lines, and two of them are parallel?

How many angles are there in the picture?

Measure the angles. Which ones have the same measure?

Again you see two parallel lines and one
line that intersects them both.

The two angles marked with a single arc are
corresponding angles.
Also the two angles marked with the double
arc are corresponding angles.

All four angles have the same measure.

	What kind of lines do you see in this picture? How many angles? Which angles have the same measure?
	Mark the rest of the angles in this picture and measure them. The figure that is enclosed by the lines is called a parallelogram.
A figure that has four sides so that the two opposite sides are parallel and the other two sides are parallel to each other, is called a parallelogram. What angles in the parallelogram have the same measure?
If all the angles in a parallelogram are right angles, it is called a rectangle.
If all the four angles are right angles and all the four sides are the same, the figure is called a square.

Example problem types

1. Calculate the other angles inside the parallelogram. Do not measure since the pictures are not exact. What are the principles you can use?

2. a) Draw a parallelogram that has a 50 angle. You can decide the length of the sides of the parallelogram. What else do you need to know to be able to draw the parallelogram?

b) Draw a parallelogram that has a 118 angle.

5. Find one corresponding angle to each of the marked angles and mark them the same way.
These pictures do have some extra lines there too but remember you need to look for two parallel lines and a line that intersects them both.

[Pictures available in the ebook]

New terms to remember:

intersecting lines
parallel lines
perpendicular lines

corresponding angles
parallelogram
rectangle
square

Next geometry lesson

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.

Parallel and perpendicular lines Free geometry lesson plan from HomeschoolMath.net

Example problem types

Parallel and perpendicular lines
Free geometry lesson plan from HomeschoolMath.net