Previous 
Next 
Recent Additions (Page 56 of 80)




Proposed Problem 88. Triangle and Quadrilateral Areas, Midpoints.


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

Intouch and Extouch Triangles. Puzzle cut: 20 Piece Classic
Based on
Proposed Problem 86. 

Proposed Problem 86. Intouch and
Extouch Triangles, Areas 

Puzzle: Marion Walter's theorem. Puzzle cut: 12 Piece ZigZag
Based on
Marion Walter's theorem 

Contact Triangles. Puzzle cut: 22 Piece Polygons
Based on
Proposed Problem 85 

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. 

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

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

Proposed Problem 80: Triangle.
Area of a triangle, side, incircle, inradius. 

Proposed Problem 79: Triangle.
Similarity, Altitudes, Orthocenter, Incircles, Inradii. 

Proposed Problem 13: Angles of a Triangle.
Hints are provided.


Proposed Problem 1: Angles of a Triangle.
Midpoint, Congruence. Hints are provided. 

I have used Geometry Expressions, the world's first Interactive
Symbolic Geometry System, to visualize the Archimedean Twins and check
out a variety of conjectures. 

Proposed Problem 78: Angles of a Circle.
Perpendicular and parallel lines, Midpoint, Diameter, Chord, Cyclic
quadrilateral, Congruence. 

Proposed Problem 77: Angles of a Circle.
Parallel lines, Cyclic quadrilateral. 

Plaza in Peru may be the America's oldest urban site
The circular structure at the ruins of Sechin Bajo is about 5,500 years
old, archaeologists report. 

Proposed Problem 76: Area of a Circle.
Square, Circle, Circular Sector. 

Proposed Problem 75: Three Intersecting Circles.
Cyclic quadrilateral, Angles.
Acquire and demonstrate mathematical reasoning ability when solving
problems. 
Go to Page: Previous 
1 
10 
20 
30 
40 
50 
60 
70 
80 
Next
