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Home : Math Topics : Geometry : Euclidean/Plane Geom. : Triangles/Polygons

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  Selected Sites   (see also All Sites in this category)

  1. Encyclopedia of Triangle Centers - Clark Kimberling
    A searchable catalogue of hundreds of special triangle points (centroid, incenter, Hofstadter points, Yff centers, Apollonius point, etc.), with a glossary, collinearities, graphics, and links to biographical sketches of geometers, geometry software and sites, and more. For pictures and constructions of selected cases, see Triangle Centers. more>>

  2. Geometric Formulas (Ask Dr. Math FAQ) - Math Forum
    Formulas for two-dimensional figures: triangle (equilateral, isosceles, right, scalene); quadrilateral (general, square, rectangle, parallelogram, rhombus, trapezoid, kite, cyclic and cyclic-inscriptable); regular polygon; circle (arc, segment, sector); ellipse; parabolic segment; and three-dimensional figures: rectangular parallelepiped (cube); prism; pyramid (square pyramid, frustum); regular polyhedron (tetrahedron, cube, octahedron, dodecahedron, icosahedron); cylinder (right circular); cone (right circular, frustum); sphere (sector, cap, segment, zone, lune); ellipsoid; circular torus; spherical polygon. Includes Defining Geometric Figures. more>>

  3. Mrs. Glosser's Math Goodies - Gisele Glosser
    Interactive math lessons that work online and offline in a Web browser, and provide immediate feedback to students, with in addition Worksheets (on circumference and area; exponents; expressions and equations; integers; Ocean Math; order of operations; percent; perimeter and area; probability; and statistics), Math Chat Boards, Math Puzzles, a Math Image Library, Educational Links, Homework Suggestions, and more. Lessons include examples, exercises, and solutions. Volumes include: Introduction to Statistics; Topics in Pre-Algebra; Probability Lessons; Integers; Understanding Percent; Number Theory; Circumference and Area of Circles; Perimeter and Area of Polygons; and Solutions. These math lessons are shareware and may be used online; registered users may save them to their desktop computers. Leçons en français are also available in French: Théorie des nombres; Circonférence et aire des circles; et Périmètre et aire des polygones. more>>

  4. Naming Polygons and Polyhedra - Math Forum, Ask Dr. Math FAQ
    What do you call an 11-sided polygon? A 14-sided polygon? Is there a list of names of polygons? What about polyhedra? more>>

  5. The Pythagorean Theorem - Math Forum, Ask Dr. Math FAQ
    What is the Pythagorean theorem? When would you use it? How can we prove it? more>>

  6. Quadrilateral Formulas (Ask Dr. Math FAQ) - Math Forum
    Formulas for finding the area, perimeter, etc. of a quadrilateral: square, rectangle, parallelogram, rhombus, trapezoid, trapezium, kite, and cyclic quadrilateral. more>>

  7. Regular Polygon Formulas (Ask Dr. Math FAQ) - Math Forum
    Formulas for finding the area, perimeter, etc. of a regular polygon, and constructing regular polygons with compass and straightedge, in particular the pentagon. more>>

  8. Triangle Centers - Clark Kimberling; Dept. of Mathematics, Univ. of Evansville, Evansville, IN
    A listing, with description and illustration, of 20th-century triangle centers (including: Schiffler Point, Exeter Point, Parry Point, congruent isoscelizers point, Yff Center of Congruence, isoperimetric point and equal detour point, Ajima-Malfatti Points, Apollonius Point, Morley Centers, Hofstadter Points, and equal parallelians points) and some classical triangle centers (including: centroid, incenter, circumcenter, orthocenter, Fermat Point, nine-point center, symmedian (or Lemoine) point, Gergonne point, Nagel point, Mittenpunkt, Spieker center, Feuerbach point, isodynamic points, and Napoleon points), as well as other references (to print works) and a list of journals that frequently publish items of interest to triangle geometers. more>>

  9. Triangle Formulas (Ask Dr. Math FAQ) - Math Forum
    Formulas for finding the area, perimeter, etc. of an equilateral, isosceles, right, or scalene triangle. more>>


 

Mason error

 
component stack:   /library/branch.html
/library/dhandler
code stack:   /var/lib/mason/obj/library/branch.html:208
/usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Commands.pm:70
/var/lib/mason/obj/library/dhandler:90

debug info:   Debug file is '/var/lib/mason/debug/anon/8'.

raw_error





























raw error:
 






























error while executing /library/branch.html:
Server message number=1105 severity=17 state=4 line=1 text=Can't allocate space for object 'syslogs' in database 'catalog' because 'logsegment' segment is full/has no free extents. If you ran out of space in syslogs, dump the transaction log. Otherwise, use ALTER DATABASE or sp_extendsegment to increase size of the segment.
Statement=INSERT INTO keystorage ( keys ) VALUES ( '61400;74997;9056;62431;76966;9025;62422;6623;75013;4559;6614;9023;2722;10780;6150;6813;850;11738;10782;13516;7677;16268;17925;5275;76728;12692;63157;74891;7940;60902;12146;6322;7708;3028;75403;5558;4205;8044;1...
HTML::Mason::Interp::__ANON__('Server message number=1105 severity=17 state=4 line=1 text=Can\'...') called at /usr/lib/perl5/site_perl/5.6.0/Forum/Key.pm line 284
Forum::Key::store('Forum::Key=HASH(0x8e850e8)') called at /var/lib/mason/obj/library/branch.html line 208
HTML::Mason::Commands::__ANON__('passed_args', 'HASH(0x8e3e520)', 'tree', 'topics', 'branch', 'triangle_g') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Component.pm line 131
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x8f0e460)', 'passed_args', 'HASH(0x8e3e520)', 'tree', 'topics', 'branch', 'triangle_g') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
HTML::Mason::Request::comp('HTML::Mason::Request::ApacheHandler=HASH(0x8e091d4)', '/library/branch.html', 'passed_args', 'HASH(0x8e3e520)', 'tree', 'topics', 'branch', 'triangle_g') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Commands.pm line 70
HTML::Mason::Commands::mc_comp('/library/branch.html', 'passed_args', 'HASH(0x8e3e520)', 'tree', 'topics', 'branch', 'triangle_g') called at /var/lib/mason/obj/library/dhandler line 90
HTML::Mason::Commands::__ANON__('start_at', 1, 'num_to_see', 50, 'keyid', 38487815) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Component.pm line 131
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x8e676d8)', 'start_at', 1, 'num_to_see', 50, 'keyid', 38487815) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
HTML::Mason::Request::comp('HTML::Mason::Request::ApacheHandler=HASH(0x8e091d4)', 'HASH(0x8e6b6d4)', 'HTML::Mason::Component::FileBased=HASH(0x8e676d8)', 'start_at', 1, 'num_to_see', 50, 'keyid', ...) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 159
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 159
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x8e091d4)', '/library/topics/triangle_g', 'start_at', 1, 'num_to_see', 50, 'keyid', 38487815) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/ApacheHandler.pm line 914
HTML::Mason::ApacheHandler::handle_request_1('HTML::Mason::ApacheHandler=HASH(0x8de2bfc)', 'Apache=SCALAR(0x8e091c8)', 'HTML::Mason::Request::ApacheHandler=HASH(0x8e091d4)', 'HASH(0x8339c0c)') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/ApacheHandler.pm line 560
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/ApacheHandler.pm line 560
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x8de2bfc)', 'Apache=SCALAR(0x8e091c8)') called at /etc/httpd/conf/handler.pl line 97
HTML::Mason::handler('Apache=SCALAR(0x8e091c8)') called at /dev/null line 0
require 0 called at /dev/null line 0