Triangles: Theorems and Problems 26

Proposed Problem 167. Parallelogram, Diagonal, Triangles, Areas.  

Proposed Problem 166. Parallelogram, Diagonal, Triangles, Areas.  

Proposed Problem 165. Parallelogram, Diagonal, Triangles, Areas.  

Proposed Problem 164. Parallelogram, Trapezoid, Diagonal, Triangles, Areas.  

Proposed Problem 163. Trapezoid, Diagonals, Triangles, Areas.  
Trapezoid Index

Proposed Problem 162. Parallelogram, Triangles, Areas.  

Proposed Problem 160. Triangle, Incircle, Incenter, Circumcircle, Circumcenter, Inradius.

Proposed Problem 159. Distances from the Circumcenter to the Incenter and the Excenters.

Proposed Problem 158. Relation between the Circumradius, Inradius and Exradii of a triangle.

Proposed Problem 157. Distance from the Circumcenter to the Excenter.

Proposed Problem 156. Triangle, Circumradius, Exradius, Chord, Secant line.  

Proposed Problem 155. Euler's Theorem: Distance from the Incenter to the Circumcenter.