Altitudes in right, acute, obtuse and equilateral triangles.
Definitions: An altitude of a triangle is a line segment through the vertex and perpendicular to the base. All three altitudes intersect at the same point called orthocenter. Right Triangle - has a 90 degree angle, altitudes meet at the vertex of the right angle Acute Triangle - has an angle less than 90 degrees, altitudes meet inside the triangle Obtuse Triangle - has an angle more than 90 degrees and has an orthocenter outside of the triangle. Equilateral Triangle - is a t