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Online Geometry: Triangle Centers,
Theorems and Problems Index, Page 2
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Triangle Centers - Table of
Content 2
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Geometry Problem 821.
Adams Circle. |
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Geometry Problem 754.
Equilateral Triangle, Center, Angle, 60 Degrees, Perimeter. |
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Problem 690: Distance between the Incenter and the Centroid of a
Triangle.
Formula in terms of the sides a,b,c. |
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Geometry Problem 689.
Triangle, Three Excircles, Tangency points, Tangent lines, Concurrent Lines, Mind Map. |
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Proposed Problem 370.
Triangle with squares, Circumcircles, Tangent circles. |
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Equal Incircles Theorem: Triangles,
cevians, circles. |
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Proposed Problem 257.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances,
Squares.
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Proposed Problem 256.
Equilateral Triangle, Circumcircle, Point, Vertices, Distances.
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Proposed Problem 255.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
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Proposed Problem 254.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
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Proposed Problem 253.
Triangle, Centroid, Vertices, Distances, Squares.
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Proposed Problem 249.
Triangle sides, medians, squares.
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Proposed Problem 248.
Napoleon's Theorem III. Inner and outer Napoleon triangles, Area.
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Proposed Problem 247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon
triangle.
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Proposed Problem 229. Triangle, Centroid, Transversal, Perpendicular
lines. |
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Proposed Problem 226. Triangle, Centroid, Perpendicular lines.
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Proposed Problem 220. Right Triangle, Altitude, Angle Bisector,
Distance, Arithmetic Mean.
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Proposed Problem 216. Quadrilateral, Angle Bisectors, and
Concurrency.
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Proposed Problem 196. Triangle,
Inradius and Exradii Formula. |
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Proposed Problem 213. Triangle, Incircle, Inradius, Semicircles,
Common Tangents. |
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Proposed Problem 209. Triangle, Incircles, Inradius. |
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Proposed Problem 208. Triangle, Excircles, Angles, 360 degrees.
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Proposed Problem 207. Right Triangle, Hypotenuse, Inradius, Exradius
relative to the hypotenuse. |
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Problem 206. Area of a Right Triangle, Inradius,
andExradius relative to the hypotenuse. |
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Proposed Problem 205. Right Triangle Area, Exradii relatives to legs
or catheti. |
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Proposed Problem 204. Right Triangle, Incircle, Excircles, Inradius,
Exradii. |
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Proposed Problem 203. Right Triangle, Excircles, Exradii,
Hypotenuse. |
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Proposed Problem 202. Right Triangle, Incicrle, Excircles relatives
to catheti, Points of Tangency, Exradius, Semiperimeter. |
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Proposed Problem 201.
Right Triangle, Excircles, Points of Tangency, Exradius, Semiperimeter.
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Proposed Problem 200. RightTriangle, Incircle, Excircles, Points of
Tangency, Inradius. |
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Proposed Problem 197. Area of a
Triangle, Side, Inradius, and Exradius. |
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Proposed Problem 196. Triangle,
Inradius and Exradii Formula. |
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Proposed Problem 195. Area of a
Triangle, Inradius, Exradii. |
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Proposed Problem 194. Area of a
Triangle, Semiperimeter, Exradius. |
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Proposed Problem 193. Area of a
Triangle, Semiperimeter, Inradius. |
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Proposed Problem 191. Triangle,
Altitudes, Orthocenter, Squares, Areas.
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Puzzle of the Nagel
Point: 22 pieces of polygons. |
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Nagel
Point Theorem - Flowchart Proof .
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Semiperimeter and excircles of a triangle.
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Semiperimeter and incircle of a triangle. |
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Semiperimeter, incircle and excircles of a triangle.
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Gergonne Point Theorem. Concurrency.
Interactive proof with animation.
Key concept: Ceva's Theorem.
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Proposed Problem 187. Right
Triangle, Altitude, Incenters, Circles, Angles. |
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Proposed Problem 186. Right
Triangle, Altitude, Incenters, Circles. |
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Proposed Problem 186. Right
Triangle, Altitude, Incenters, Circles. |
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Proposed Problem 160. Triangle,
Incircle, Incenter, Circumcircle, Circumcenter, Inradius. |
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Proposed Problem 159. Distances
from the Circumcenter to the Incenter and the Excenters. |
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Proposed Problem 158. Relation
between the Circumradius, Inradius and Exradii of a triangle. |
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Proposed Problem 157. Distance
from the Circumcenter to the Excenter. |
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