orthocenter and circumcenter
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The orthocenter of a triangle may lie outside the triangle because an altitude does not necessarily intersect the sides of the triangle.
My daughter's math teacher recommended the following site, which was enormously helpful for her. Here's a link to the 'orthocenter' topic, and you can find a bunch of other math topic videos there. It is all free. Hope it will help.http://www.brightstorm.com/d/math/s/geometry/u/constructions/t/constructing-the-orthocenter
A. A perpendicular line to one side of the triangle. ~Apex
A triangle can have equal sides. This is called an equilateral triangle. Other triangles may not have equal sides.