# Online Geometry: Circles, Theorems and Problems

 Circles, Theorems and Problems: Table of Content (Page 6 of 10) Proposed Problem 155. Euler's Theorem: Distance from the Incenter to the Circumcenter. Proposed Problem 154. Triangle, Inradius, Circumradius, Chord. Proposed Problem 153. Circumscribed Quadrilateral, Diagonals Concurrent with Chords. Proposed Problem 152. Circumscribed Quadrilateral, Diagonal, Chord, Proportion. 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. Proposed Problem 127. Centroid and Incenter of a Triangle, Parallel, Proportions. Proposed Problem 126. Incenter of Triangle, Angle Bisector, Proportions. Proposed Problem 120. Area of triangle, incenter, excircles, tangent. Proposed Problem 119. Area of triangle, incenter, excircle, tangent. Proposed Problem 118. Area of triangle, incenter, excenter, tangent. Proposed Problem 117. Area of triangle, incenter, excircles, tangent. Proposed Problem 116. Area of triangle, excircles, tangent. Proposed Problem 115. Area of triangle, excircles, tangent. Proposed Problem 114. Area of triangle, incircle, excircle. Proposed Problem 113. Area of triangle, incircle, excircle. Stonehenge builders had geometry skills to rival Pythagoras Five years of detailed research, carried out by the Oxford University landscape archaeologist Anthony Johnson, claims that Stonehenge was designed and built using advanced geometry. Proposed Problem 112. Area of square and triangle. Proposed Problem 111. Orthogonal Circles. Proposed Problem 110. Area of Contact Triangle. Bandurria is the oldest Peruvian archaeological site, says expert Bandurria may rival Caral as oldest citadel in Americas. Satellite View: circular ceremonial center Eight-Point Circle Theorem Step-by-Step construction, Manipulation, and animation. Go to Page: Previous | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Next

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