Online Geometry: Circles, Theorems and Problems

Circles - Table of Content (Page 18)

Proposed Problem 152. Circumscribed Quadrilateral, Diagonal, Chord, Proportion.  

Machu Picchu and Golden Rectangle.  

Proposed Problem 145. Four Triangles, Incircle, Tangent and Parallel to Side, Incenters, Circumcenters.  

Proposed Problem 144. Four Triangles, Incircle, Tangent and Parallel to Side, Inradii.  

Proposed Problem 143. Four Triangles, Incircle, Tangent and Parallel to Side, Circumradii.  

Proposed Problem 142. Four Triangles, Incircle, Tangent and Parallel to Side, Areas.  

Proposed Problem 141. Triangle, Incircle, Tangent , Parallel, Perimeters.  

Proposed Problem 140. Triangle, Excircle, Tangent, Semiperimeter.  

Proposed Problem 136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points.  

Interactive Gergonne Line and Nobbs Points. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.

Interactive Simson Line. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.

Triangle, Three Medians, Six Concyclic Circumcenters. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Triangle: Incircle, Perpendicular, Angle Bisector. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Proposed Problem 128. Incenter of a Triangle, Angle Bisectors, Sum of Ratios.

Geometry in Action. Reuleaux's rotor: How Round is your Circle?

Proposed Problem 127. Centroid and Incenter of a Triangle, Parallel, Proportions.

Proposed Problem 126. Incenter of Triangle, Angle Bisector, Proportions.

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