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![College Geometry Online, eLearning](../machu_picchu_h1_910.jpg)
Altitude of a Triangle, Theorems and Problems - Table of Content
4
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![Altitude of a triangle](altitude_triangle_17.jpg) |
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![Geometry Problem 135](../problem/p135_orthic_triangle_17.jpg) |
Proposed Problem 135. Orthic
Triangle, Altitudes, Perpendicular, Parallel |
![Geometry Problem 134](../problem/p134_orthic_triangle_17.jpg) |
Proposed Problem 134. Orthic
Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter. |
![Elearning 91](../problem/p091_similarity_elearning_17.jpg) |
Proposed Problem 91. Similar
Triangles, Altitudes, Parallel. |
![](taylor_circle_theorem.jpg) |
Taylor Circle Theorem Feet of
each altitude.
Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation.
Henry Martyn Taylor and the blind student of mathematics
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![](../problem/p079_triangle_similar_17.jpg) |
Proposed Problem 79: Triangle.
Similarity, Altitudes, Orthocenter, Incircles, Inradii. |
![](../problem/p070_squares_inscribed_17.jpg) |
Proposed Problem 70: Squares inscribed in a triangle, Similarity.
Altitude.
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![](../problem/p069_square_inscribed_17.jpg) |
Proposed Problem 69: Square inscribed in a triangle, Similarity.
Altitude.
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![](feuerbach_points_17.jpg) |
Feuerbach Points and Nine-Point Circle with interactive
animation, manipulation, and step-by-step construction. |
![](../center/nine_point_center_euler_170.jpg) |
Nine-Point Center, Nine-Point Circle, Euler Line.
Interactive illustration.
Altitudes, Orthocenter.
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![de Gua's theorem](../solid/gua_theorem_170.jpg) |
Geometry Problem
800: de Gua's Theorem
Pythagorean theorem in 3-D, Tetrahedron, Cubic Vertex, Triangular Pyramid, Apex, Height, Right Triangle Area, Base Area, Projected Area. |
![](../triangle_square/triangle_square_22_170.jpg) |
Triangle and Squares 22
Altitudes |
![](../problem/p051_fagnano_triangle_170.jpg) |
Proposed Problem
51: Fagnano's Problem
Inscribed Triangle with the Minimum Perimeter.
Altitudes.
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![](../pythagoras/right_triangle_facts_170.jpg) |
Right Triangles, Formulas and Facts
Pythagorean theorem, Similarity, Geometric mean,
hypotenuse, catheti (legs), semiperimeter, altitude, median,
similar shapes areas, centers, orthocenter, incenter,
centroid, circumcenter, radius, inradius, circumradius,
exradius, circles, incircle, circumcircle, excircle. |
![](../triangle_square/triangle_square_20_170.jpg) |
Triangle and Squares
20
Altitude. |
![](../problem/p049_right_triangle_170.jpg) |
Proposed Problem 49.
Right triangle, Altitude, Angles.
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