Plane Geometry: Area of a triangle, Theorems
and Problems  Table of Content  Page 8




Proposed Problem 85. Contact
Triangles Areas, Incircle, Excircle. 

Proposed Problem 84. Contact
Triangles Areas, Incircle, Excircle, Inradius, Exradius. 

Proposed Problem 83. Area of the
Excircle Contact Triangle, exradius, circumradius. 

De Gua's Theorem
Area of triangles. 

Triangle and Squares 22
Area of triangles and rectangles.


Hippocrates and Squaring the Circle
Triangle areas 

Heron's Formula with medians Triangle
areas. 

Kurschak's Tile and Theorem.
Jozsef Kurschak (Hungary, 18641933) An elegant and a purely geometric
way of finding the area of a regular dodecagon.
Triangle areas. 

Euclid's Elements
Book I, 23 Definitions. Onepage visual illustration.
Euclid's Elements Book.
Index 

Varignon and Wittenbauer parallelograms. Quadrilateral: midpoints and
trisection points of the edges. Triangle areas.

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