

Geometry: Incenter, Incircle, Inradius of a triangle, Theorems
and Problems.




Proposed Problem 247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon
triangle.


Proposed Problem 246.
Napoleon's Theorem I. External Equilateral triangles. 

Proposed Problem 220 Incenter. Right Triangle, Altitude, Angle
Bisector, Distance, Arithmetic Mean.


Proposed Problem 216 Incenter, Excenter. Quadrilateral, Angle
Bisectors, and Concurrency.


Proposed Problem 215.
Quadrilateral, Angle Bisectors, and Cyclic
Quadrilateral.


Proposed Problem 213. Triangle, Incircle, Inradius, Semicircles,
Common Tangents. 

Proposed Problem 209. Triangle, Incircles, Inradius. 

Proposed Problem 207. Right Triangle, Hypotenuse, Incenter,
Inradius, Exradius relative to the hypotenuse. 

Problem 206. Area of a Right Triangle, Inradius, and
Exradius relative to the hypotenuse. 

Proposed Problem 204. Right Triangle, Incircle, Excircles, Inradius,
Exradii. 

Proposed Problem 202. Right Triangle, Incircle, Excircles relatives
to catheti, Points of Tangency, Exradius, Semiperimeter. 

Proposed Problem 200. Right Triangle, Incircle, Excircles, Points of
Tangency, Inradius. 

Proposed Problem 197. Area of a
Triangle, Side, Incircle, Inradius, and Exradius. 

Proposed Problem 196. Triangle,
Incircle, Inradius and Exradii Formula. 

Journey to the
Center of a Triangle (1976), Video. Incenter, Circumcenter, Centroid,
Orthocenter.


Proposed Problem 195. Area of a
Triangle, Incircle, Inradius, Exradii. 

Proposed Problem 193. Area of a
Triangle, Semiperimeter, Inradius. 

Proposed Problem 187. Right
Triangle, Altitude, Incenters, Circles, Angles. 
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