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Recent Additions (Page 18 of 80)




Geometry Problem 668.
Right triangle, Incircles, Parallel, Common Tangent, Mind Map. 

Geometry Problem 667.
Intersecting Circles, Secant, Tangent, Metric Relations, Mind Map. 

Geometry Problem 666.
Intersecting Circles, Secant, Tangent, Concyclic points, Mind Map. 

Geometry Problem 665.
Intersecting Circles, Secant, Tangent, Angles, Mind Map. 

Altitude Index.
Theorems and Problems. 

Geometry Problem 664.
Triangle, 60 Degrees, Orthocenter, Incenter, Circumcenter, Angles,
Triangle centers. 

Geometry Problem 663.
Scalene Triangle, 60 Degrees, Altitude, Angle Bisector, Perpendicular Bisector,
Concurrent lines. 

Video solution: Problems 16 (Spanish version)
By Eder Contreras and Cristian Baeza, Chile. 

Geometry Problem 662.
Triangle, Incenter, Circumcenter, Orthocenter, Circle, Angle, Measurement. 

Geometry Problem 661.
Intersecting Circles, Centers, Secant, Parallelogram. 

Geometry Problem 660.
Triangle, Circle, Diameter, Perpendicular Lines. 

Formal
sciences Mind Map. 

Geometry Problem 659.
Parallelogram, Parallel Lines, Collinear Points. 

Geometry Problem 658.
Triangle, Altitudes, Diameter, Circle, Angles. 

Geometry in the Real World,
Detroit, Michigan  Slideshow. 

Geometry Problem 657.
Triangle, Incircle, Tangency Points, Parallel Lines, Congruence. 

Definitions. 

Semicircle
Definition.


Tangent
Definition.


Semicircle.
Index.
Theorems and Problems.


Circle definition.


Geometry Problem 656.
Triangle, Cevian, Concurrent Lines. 

Brahmagupta Theorem and Problems  Index
Brahmagupta (598–668) was an Indian mathematician and astronomer who discovered a neat formula for the area of a cyclic quadrilateral. 

Distances between Triangle Centers
Index.


Madonna of the Goldfinch by Raphael and Golden Rectangles 

Geometry Problem 635
Semicircle, Diameter, Perpendicular, Inscribed Circle, Radius. 

Schiffler Point:
Four Euler Lines with interactive animation and
manipulation
Tracenpoche Interactive Geometry Software.


Geometry Problem 634
Right Triangle, Altitude, Incenters, Areas. 
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