
Geometry Problems 81  90




Proposed Problem 81. Area of a
triangle, side, inradius, circumradius. 

Proposed Problem 82. Area of the
Contact Triangle, inradius, circumradius. 

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

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

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

Proposed Problem 86. Intouch and
Extouch Triangles, Areas. 

Proposed Problem 87. Area of
Quadrilaterals and Midpoints of Diagonals. 

Proposed Problem 88. Triangle and Quadrilateral Areas, Midpoints. 

Proposed Problem 89. Triangles of equal area, Midpoints. 

Proposed Problem 90.
Quadrilateral and Triangle Areas, Midpoints. 

