Triangles: Theorems and Problems 23

Archimedes Arbelos and Square 2. Dynamic Geometry Software.
Step-by-Step construction, Manipulation, and animation.

Archimedes Arbelos and Square 1. Dynamic Geometry Software.
Step-by-Step construction, Manipulation, and animation.

Proposed Problem 211. 60 Degree Triangle, Equilateral triangles, Areas.

Proposed Problem 210. Triangle, Angles, Auxiliary Lines.

Proposed Problem 209. Triangle, Incircles, Inradius.  

Proposed Problem 208. Triangle, Excircles, Angles, 360 degrees.  

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

Proposed Problem 208. Triangle, Excircles, Angles, 360 degrees.  

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

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

Proposed Problem 205. Right Triangle Area, Exradii relatives to legs or catheti.