Elearn Geometry Problem 238: Square, Midpoints, Lines, Congruence

See complete Problem 238 at:
gogeometry.com/problem/p238_square_midpoints_congruence.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 237: Quadrilateral, Midpoints, Exterior line, Perpendicular lines

See complete Problem 237 at:
gogeometry.com/problem/p237_quadrilateral_midpoint_exterior_line_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 236: Quadrilateral, Midpoints, Exterior line, Perpendicular lines

See complete Problem 236 at:
gogeometry.com/problem/p236_quadrilateral_midpoint_exterior_line_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Butterfly Theorem Puzzle

Interactive Puzzle
Click the figure to solve the interactive puzzle of Butterfly theorem.



Continue reading at:
gogeometry.com/puzzle/Puzzle_Butterfly_theorem.htm


See also:
Puzzle - Index

Elearn Geometry Problem 235: Parallelogram, Transversal line, Perpendicular lines

See complete Problem 235 at:
gogeometry.com/problem/p235_parallelogram_transversal_perpendicular_lines.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Biometrics terms

Interactive Glossary
Click the figure to see the interactive glossary of Biometrics terms.



Continue reading at:
gogeometry.com/glossary_terms/biometric_online.htm

Elearn Geometry Problem 234: Parallelogram, Line through a vertex, Perpendicular lines

See complete Problem 234 at:
gogeometry.com/problem/p234_parallelogram_vertex_perpendicular_lines.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 184: Triangle, Angles

Proposed Geometry Problem and Solutions.




See complete Problem 184 at:
www.gogeometry.com/problem/p184_triangle_angles_problem.htm

The following solution was received from Ibrahim Elsager.




Post your solutions or ideas in the comments.

Elearn Geometry Problem 233: Parallelogram, Exterior line, Perpendicular lines

See complete Problem 232 at:
gogeometry.com/problem/p233_parallelogram_perpendicular_lines.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Parallelograms, Definition, Theorems, Problems

Parallelogram Index
Click the figure to see the parallelogram index and the Venn Diagram.



Continue reading at:
http://gogeometry.com/geometry/parallelogram_index_quadrilateral_side_parallel.html

Elearn Geometry Problem 232: Parallelogram, Vertex, Perpendicular lines

See complete Problem 232 at:
gogeometry.com/problem/p232_parallelogram_perpendicular_lines.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 231: Triangle, Midpoint, Transversal

See complete Problem 231 at:
gogeometry.com/problem/p231_triangle_midpoint_transversal_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 230: Triangle, Midpoint, Transversal

See complete Problem 230 at:
gogeometry.com/problem/p230_triangle_midpoint_transversal_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 229: Triangle, Centroid, Transversal

See complete Problem 229 at:
gogeometry.com/problem/p229_triangle_centroid_transversal_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Algebra, Interactive Glossary

A glossary is a list of terms in a particular domain of knowledge with the definitions for those terms. Traditionally, a glossary appears at the end of a book and includes terms within that book which are either newly introduced or at least uncommon.



Continue reading at:
gogeometry.com/glossary_terms/algebra_online_glossary_college.htm

Elearn Geometry Problem 228: Triangle, Midpoint, Exterior line

See complete Problem 228 at:
gogeometry.com/problem/p228_triangle_midpoint_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 227: Triangle, Centroid, Exterior line

See complete Problem 227 at:
gogeometry.com/problem/p227_triangle_centroid_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 226: Triangle, Centroid, Perpendiculars

See complete Problem 226 at:
gogeometry.com/problem/p226_triangle_centroid_perpendicular.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

Elearn Geometry Problem 225: Viviani Theorem Extension

Regular Polygon, Apothem, Distance
In a regular n-sided polygon, the sum of the perpendicular distances from an interior point to the n sides being n times the apothem of the polygon.



See complete Problem 225 at:
gogeometry.com/problem/p225_viviani_theorem_regular_polygon.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 224: Viviani Theorem, Isosceles Triangle

Altitude, Distance, Point on the extension of the base
In an isosceles triangle ABC (AB = BC), the sum of the distances from any point on the extension of CA to the equal sides is equal to the altitude of the equal sides.



See complete Problem 224 at:
gogeometry.com/problem/p224_viviani_theorem_isosceles_triangle.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 223: Viviani Theorem, Isosceles Triangle

Altitude, Distance
In an isosceles triangle ABC (AB = BC), the sum of the distances from any point on AC to the equal sides is equal to the altitude of the equal sides.



See complete Problem 223 at:
gogeometry.com/problem/p223_viviani_theorem_isosceles_triangle.htm

Level: High School, SAT Prep, College geometry

Lost Crops of the Incas

Interactive Mind Map Crops of the Incas Mindmap is an interactive mind map based on the "lost crops" of the Incas selected by the National Research Council Ad Hoc Panel. Click the figure below to see the interactive mind map.

Continue reading at: www.gogeometry.com/incas1/crops_of_the_incas.html.

Elearn Geometry Problem 222: Viviani Theorem, Exterior point

Equilateral Triangle, Exterior Point
For a given point D outside an equilateral triangle ABC, the sum of the distances DE and DF minus DG from the point D to the sides BC, AB and AC respectively is equal to the altitude of the triangle.



See complete Problem 222 at:
gogeometry.com/problem/p222_viviani_theorem_equilateral_triangle_exterior.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 221: Viviani Theorem

Equilateral Triangle, Interior Point
In an equilateral triangle, prove that the sum of the distances from any interior point to the sides is equal to the altitude of the triangle.



See complete Problem 221 at:
gogeometry.com/problem/p221_viviani_theorem_equilateral_triangle.htm

Level: High School, SAT Prep, College geometry

UNESCO World Heritage List

Interactive Mind Map Peru is home of 10 sites: City of Cuzco (1983), Historic Sanctuary of Machu Picchu (1983), Chavin (Archaeological Site) (1985), Huascarán National Park (1985) # Chan Chan Archaeological Zone (1986), Manú National Park (1987), Historic Centre of Lima (1988, 1991), 17 Río Abiseo National Park (1990, 1992), Lines and Geoglyphs of Nasca and Pampas de Jumana (1994), Historical Centre of the City of Arequipa (2000). Click the figure below to see the interactive mind map.

See more:.
See also: Inca News Index.

Studies reveal DNA links between Pre-Inca Mochicas and Japanese

A study of ancient reveals an interesting finding. The second phase of the research will analyze the DNA of the descendants. To confirm the ties that existed between the people of Lambayeque, Peru and citizens of other parts of the ancient world, Dr. Ken-Ichi Shinoda conducted during three years, a series of DNA analysis, with support from U.S. laboratories, under the coordination of the head of the Archaeological Project Sicán, Izumi Shimada.

Read more..

Lune of Hippocrates Index

Hippocrates of Chios (c.470 BC - c.410 BC) was a Greek mathematician who worked on the classical problems of squaring the circle and duplicating the cube.



Continue reading at:
gogeometry.com/geometry/lune_hippocrates_quadrature_index.html

Elearn Geometry Problem 220: Right Triangle, Altitude, Angle Bisector, Distance, Arithmetic Mean

See complete Problem 220 at:
gogeometry.com/problem/p220_right_triangle_altitude_inradius_angle_bisector_distance.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 219: Rhombus, perpendiculars, arithmetic mean

See complete Problem 219 at:
gogeometry.com/problem/p219_rhombus_perpendicular_arithmetic_mean.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 218: Right triangle, Altitude and Distances

See complete Problem 218 at:
gogeometry.com/problem/p218_right_triangle_altitude_perpendicular.htm

Level: High School, SAT Prep, College geometry

Google Gadget: MC Escher

Add "Random Kaleidoscope" to your iGoogle page.
iGoogle is a more personal way to use Google.com. Customize your page anyway you like, by adding your favorite themes and gadgets. Click the (+)Google button below.

Add "M.C. Escher, Random Kaleidoscope" to your iGoogle page.

Elearn Geometry Problem 217: Right triangle, Altitude and Projections

See complete Problem 217 at:
gogeometry.com/problem/p217_right_triangle_altitude_projection_congruence.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 216: Quadrilateral, Angle Bisectors, and Concurrency

See complete Problem 216 at:
gogeometry.com/problem/p216_quadrilateral_angle_bisector_concurrency.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 215: Quadrilateral, Angle Bisectors, Cyclic Quadrilateral

See complete Problem 215 at:
gogeometry.com/problem/p215_quadrilateral_angle_bisector_cyclic.htm

Level: High School, SAT Prep, College geometry

Elearn Geometry Problem 214: Quadrilateral, Angle Bisectors

See complete Problem 214 at:
gogeometry.com/problem/p214_quadrilateral_angle_bisector.htm

Level: High School, SAT Prep, College geometry

Problem Solving Interactive Mind Map

Problem Solving forms part of thinking. Considered the most complex of all intellectual functions, problem solving has been defined as higher-order cognitive process that requires the modulation and control of more routine or fundamental skills. Click the figure below.



Continue reading at:
gogeometry.com/mindmap/problem_solving_cognitive_process.html