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Maria's Math news - a FREE math newsletter for parents and teachers
Latest from my blog
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.
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.
Learn how to TEACH concepts or about general concerns in math education.
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.
Altitude of a triangle
|The altitude of a triangle is a line
segment from one vertex of a triangle
to the opposite side so that the line
segment is PERPENDICULAR to the side.
Look at the pictures. In other words,
(1) it starts at a vertex and
(2) is perpendicular to the side.
Note how the altitude of an obtuse triangle can fall outside of the triangle.
|You can draw the altitude from ANY vertex of the triangle.|| In fact, to
every triangle you can
draw three different altitudes.
Note in the last picture how
amazingly they all three intersect
in the same point!
1. Draw one altitude to each of the triangles. You can choose which vertex you want to draw it from.
[Pictures available in the ebook]