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en.wikipedia.org/wiki/Altitude_(triangle)

In geometry, an

www.mathopenref.com/altitude.html

Definition of the math word Altitude. Includes definitions for the

www.dummies.com/how-to/content/finding-the-altitude-of-a-triangle.html

The

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Apr 28, 2008 ... For a complete lesson on median, altitude , and perpendicular bisector, go to http:
//www.MathHelp.com - 1000+ online math lessons featuring a ...

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Dec 13, 2009 ... constructing altitudes in a triangle. ... Constructing an Altitude of a Triangle -
Duration: 5:14. Mathispower4u 25,148 views. 5:14.

mathworld.wolfram.com/Altitude.html

connecting the feet of the altitudes is known as the orthic triangle. The

www.cut-the-knot.org/triangle/altitudes.shtml

Existence of the orthocenter in many different ways (now 22). In any

www.homeschoolmath.net/teaching/g/altitude.php

You are given a

planetcalc.com/53/

Jun 7, 2008

www.cliffsnotes.com/study-guides/geometry/triangles/altitudes-medians-and-angle-bisectors

Every

Answer

How to Find the Altitude of a Triangle

The altitude of a triangle is a straight line projected from a vertex (corner) of the triangle perpendicular (at a right angle) to the opposite side. The altitude is the shortest distance between the vertex and the opposite side, and divides the triangle...
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Difficulty:
Moderate

Source:
www.ehow.com

More Info

www.mathopenref.com

This page shows how to construct one of the three possible

www.mathwords.com

www.khanacademy.org

Showing that any triangle can be the medial triangle for some larger triangle.
Using this to show that the