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Altitude of a Triangle

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Videos that will help GMAT students review some questions on the altitude of a triangle.

What is the altitude of a triangle?
The altitude of a triangle is a line segment from a vertex that is perpendicular to the opposite side. A triangle has three altitudes. The point of concurrency is called the orthocenter.
The orthocenter can be inside, on, or outside the triangle based upon the type of triangle.

The Altitudes of a Triangle This video defines an altitude and orthocenter of a triangle.
Constructing an Altitude of a Triangle

Video on Altitude of a Triangle - Geometry Help
Students learn the definition of an altitude of a triangle,
How to Find the Altitude of a Right Triangle?

Isosceles Triangle Properties
In isosceles (and equilateral) triangles, a segment drawn from the vertex angle to the opposite side is the altitude, angle bisector and median. Isosceles triangle properties are used in many proofs and problems where the student must realize that, for example, an altitude is also a median or an angle bisector to find a missing side or angle.
Theorem: In an isosceles triangle ABC the median, bisector and altitude drawn from the angle made by the equal sides fall along the same line.

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