Triangles: Theorems and Problems 22
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Elearn 232: Parallelogram, perpendicular lines](http://gogeometry.com/
problem/p232_parallelogram_problem_.jpg) |
Proposed Problem
232. Parallelogram, Line through a vertex, Perpendicular lines.
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![Elearn 231: Triangle, Midpoint](http://gogeometry.com/
problem/p231_triangle_midpoint_17.jpg) |
Proposed Problem
231. Triangle, Midpoints, Transversal, Perpendicular lines.
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![Elearn 230: Triangle, Midpoint, Transversal](../problem/p230_triangle_midpoint_17.jpg) |
Proposed Problem
230. Triangle, Midpoints, Transversal, Perpendicular lines.
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![Elearn 229: Triangle, Centroid, Transversal](../problem/p229_triangle_centroid_17.jpg) |
Proposed Problem
229. Triangle, Centroid, Transversal, Perpendicular lines. |
![Elearn 228: Triangle, Midpoint](../problem/p228_triangle_midpoint_17.jpg) |
Proposed Problem
228. Triangle, Midpoints, Exterior line, Perpendiculars lines.
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![Elearn 227: Triangle, Centroid](../problem/p227_triangle_centroid_17.jpg) |
Proposed Problem
227. Triangle, Centroid, Exterior line, Perpendicular lines. |
![Problem 226: Triangle, Centroid](../problem/p226_triangle_centroid_17.jpg) |
Proposed Problem
226. Triangle, Centroid, Perpendiculars. |
![Viviani theorem, isosceles triangle, extension on the base](../problem/p224_viviani_theorem_17.jpg) |
Proposed Problem
224. Viviani's theorem, Isosceles triangle,
Altitude, Distances, Point on the extension of the base. |
![Viviani theorem, Isosceles triangle](../problem/p223_viviani_theorem_17.jpg) |
Proposed Problem
223. Viviani's theorem, Isosceles triangle,
Altitude, Distances. |
![Viviani theorem, Equilateral triangle, exterior point](../problem/p222_viviani_theorem_17.jpg) |
Proposed Problem
222. Viviani's theorem, Equilateral triangle, Exterior point,
Distances. |
![Viviani's theorem I](../problem/p221_viviani_theorem_17.jpg) |
Proposed Problem
221. Viviani's theorem, Equilateral triangle, Interior point,
Distances. |
![Lune of Hippocrates Index](../geometry/lune_hippocrates_index_17.jpg) |
Lune of Hippocrates Index.
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![Right triangle, inradius, altitude, arithmetic mean](../problem/p220_right_triangle_17.jpg) |
Proposed Problem
220. Right Triangle, Altitude, Angle Bisector, Distance, Arithmetic Mean.
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![Elearn 218: Right triangle](../problem/p218_right_triangle_17.jpg) |
Proposed Problem
218. Right triangle, Altitude and Projections.
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![Elearn 217: Right triangle, Altitude, Projections](../problem/p217_right_triangle_17.jpg) |
Proposed Problem
217. Right triangle, Altitude and Projections.
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![Elearn: Quadrilateral, Angle Bisectors, Concurrency](../problem/p216_quadrilateral_concurre.jpg) |
Proposed Problem
216. Quadrilateral, Angle Bisectors, and Concurrency.
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![Triangle Centers Video](../center/triangle_center_video_17.jpg) |
Journey to the Center of a Triangle (1976).
Incenter, Circumcenter, Centroid, Orthocenter.
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![Congruent triangle video](../geometry/congruent_triangle_17.jpg) |
Congruent Triangles: SAS, SSS, ASA.
Demonstrates with animation the various relationships of angles and sides to congruency in triangles.
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![Elearn 213 Triangle Inradius, Common Tangents](../problem/p213_triangle_circle_170.jpg) |
Proposed Problem
213. Triangle, Incircle, Inradius, Semicircles, Common Tangents. |
![Elearn 212: 120 degree triangle, area](../problem/p212_triangle_120_area_17.jpg) |
Proposed Problem
212. 120 Degree Triangle, Equilateral triangles, Areas.
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