Octagons Index

Theorems and Problems about the Octagon



Read more: Octagon Index, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Swine Flu Mind Map

Interactive Mind Map
Swine influenza (also swine flu) refers to influenza caused by any strain of the influenza virus endemic in pigs (swine). Strains endemic in swine are called swine influenza virus (SIV).

Click the figure below to see the interactive mind map.



Read more:
Swine Flu Interactive Mind Map

Problem 286: Square, Midpoints, Octagon

Proposed Problem



See also: Complete Problem 286, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 285: Circular Sector 90 degrees, Semicircles, Circle, Tangent, Radius

Proposed Problem



See also: Complete Problem 285, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 284: Circular Sector 90 degrees, Semicircles, Tangent, Radius

Proposed Problem



See also: Complete Problem 284, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Incenter, Incircle, Theorems, Problems, Index

Theorems and Problems about the Incenter of a triangle



Read more: Incenter of a triangle, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 283: Circular Sector 90 degrees, Semicircle, Circle inscribed, Radius

Proposed Problem



See also: Complete Problem 283, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Complete List of Go Geometry Problems

Proposed Problems



Read more: Complete List of Go Geometry Problems, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

The Pinwheel Galaxy (Messier M101 or NGC 5457)

Golden Rectangle
Why do many galaxies appear as spirals? A striking example is M101, whose relatively close distance of about 27 million light years allows it to be studied in some detail.

Click the figure below to see the interactive illustration of the The Pinwheel Galaxy (Messier M101 or NGC 5457).



See also:

The Pinwheel Galaxy (Messier M101 or NGC 5457), Golden Rectangles

Problem 282: Right Triangle, Cevian, Angles, Perpendicular, Congruence

Proposed Problem



See also: Complete Problem 282, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 281: Triangles, Angles, Isosceles, Equilateral, Congruence

Proposed Problem



See also: Complete Problem 281, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Cyclic Quadrilateral Index

Theorems and Problems about the Cyclic Quadrilateral



Read more: Cyclic Quadrilateral, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Angle Bisector Index

Theorems and Problems about the Angle Bisector



Read more: Angle Bisector, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 31: Right Triangle, Incenter, Collinear

Proposed Problem



See also: Complete Problem 31, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 30. Right Triangle, Incenter, Inradius

Proposed Problem



See also: Complete Problem 30, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

The Abel Prize: Drawing parallels in geometry

Mikhail Gromov has been awarded the Abel Prize for his work making sense of the range of geometries that appeared in the 19th century and he is a worthy successor to the likes of Euclid, Riemann and Gauss, Bolyai and Lobachevsky.





Read more at:
Drawing parallels in Geometry

Problem 29. Right Triangle, Altitude, Incircle, Angle bisector, Inradius

Proposed Problem



See also: Complete Problem 29, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 28. Right Triangle, altitude, incircles, inradius

Proposed Problem



See also:Complete Problem 28, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Problem 27: Right triangle, Incenter, Parallel, Incircles, Inradius

Proposed Problem



See also:Complete Problem 27, Collection of Geometry Problems

Level: High School, SAT Prep, College geometry

Gromov: Russian-French mathematician receives the Abel Prize

The Norwegian Academy of Science and Letters has decided to award the Abel Prize for 2009 to the Russian-French mathematician Mikhail Leonidovich Gromov (65) for "his revolutionary contributions to geometry".





Read more at:
The Abel Prize 2009

Problem 26: Right triangle, Altitude, Incircles, Inradius

Proposed Problem



See complete Problem 26 at:
gogeometry.com/problem/p026_right_triangle_incircles_incenter.htm

Level: High School, SAT Prep, College geometry

Problem 25: Right triangle, Altitude, Incircles, Incenter, Angle Bisector

Proposed Problem



See complete Problem 25 at:
gogeometry.com/problem/p025_right_triangle_incircles_incenter.htm

Level: High School, SAT Prep, College geometry

Problem 24: Right triangle, Altitude, Incircles

Proposed Problem



See complete Problem 24 at:
gogeometry.com/problem/p024_right_triangle_incircles.htm

Level: High School, SAT Prep, College geometry

Problem 23: Right triangle, Altitude, Inradius

Proposed Problem



See complete Problem 23 at:
gogeometry.com/problem/p023_right_triangle_incircles.htm

Level: High School, SAT Prep, College geometry

Angles - Index

Theorems and Problems about angles.





Read more at:
gogeometry.com/geometry/angles_theorems_problems_index.htm

Problem 22: Right triangle, Altitude, Perpendiculars, Inradii

Proposed Problem



See complete Problem 22 at:
gogeometry.com/problem/p022_right_triangle_incircles.htm

Level: High School, SAT Prep, College geometry

Problem 21: Acute triangle, Orthocenter, Diameter

Proposed Problem



See complete Problem 21 at:
gogeometry.com/problem/p021_triangle_orthocenter_tangent.htm

Level: High School, SAT Prep, College geometry

Problem 20: Right Triangle, Altitude, Inradii, Perpendicular

Proposed Problem



See complete Problem 280 at:
http://gogeometry.com/problem/p020_right_triangle_incircle.htm

Level: High School, SAT Prep, College geometry

Problem 280: Quadrilateral, Perpendiculars, Area of Squares

Proposed Problem



See complete Problem 280 at:
gogeometry.com/problem/p280_quadrilateral_perpendicular_squares_areas.htm

Level: High School, SAT Prep, College geometry

Problem 279: Tangent Circles, Common External Tangent, Chords, Inradius

Proposed Problem



See complete Problem 279 at:
gogeometry.com/problem/p279_tangent_circle_common_external_tangent_chord_inradius.htm

Level: High School, SAT Prep, College geometry

Problem 278: Tangent Circles, Common External Tangent, Chord

Proposed Problem



See complete Problem 278 at:
gogeometry.com/problem/p278_tangent_circle_common_external_tangent_chord.htm

Level: High School, SAT Prep, College geometry

Problem 277: Tangent Circles, Common External Tangent

Proposed Problem



See complete Problem 277 at:
gogeometry.com/problem/p277_tangent_circle_common_external_tangent.htm

Level: High School, SAT Prep, College geometry

Problem 276: Square, 90 degree Arcs, Circle, Radius

Proposed Problem



See complete Problem 276 at:
gogeometry.com/problem/p276_square_circle_90_degree_arc.htm

Level: High School, SAT Prep, College geometry