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  Selected Sites   (see also All Sites in this category)

  1. Constructions with ruler and compass - Zef Damen
    A page that answers the question, What are ruler-and-compass constructions? With links to step-by-step drawings for constructions: bisecting a given angle; constructing: a line perpendicular to a given line that divides it into two equal parts; a line perpendicular to a given line passing through a given point on the line (or not on the line); the horizontal and vertical centerlines of a given circle; an equilateral triangle, given one side; an equilateral triangle inscribed in a given circle; a pentagon inscribed in a given circle; a hexagon, given one side, or inscribed in a given circle; a heptagon. more>>

  2. Geometric Constructions - Dave Rusin; The Mathematical Atlas
    An introduction to geometric constructions using a ruler and compass. History; applications and related fields and subfields; textbooks, reference works, and tutorials; software and tables; selected topics; other web sites with this focus. more>>

  3. Geometric Construction with the Compass Alone - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    Information and exercises about geometric constructions: almost everything you can do with a ruler and a compass you can do with the compass alone. more>>

  4. Geometry Construction Reference - Paul Kunkel
    The basics of compass and straightedge construction, with notes about The Instruments and What is a construction? Construct the perpendicular bisector or the midpoint of a line segment; given a point on a line, construct a perpendicular line through the given point; given a point not on a line, construct a perpendicular line through the given point; construct the bisector of an angle; an angle congruent to a given angle; a line through a given point, parallel to a given line; an equilateral triangle or a 60-degree angle; divide a line segment into n congruent line segments; construct a line through a given point tangent to a given circle; construct the center point of a given circle; a circle through three given points; circumscribe a circle about a given triangle; inscribe a circle in a given triangle. more>>

  5. Impossible Constructions - Math Forum, Ask Dr. Math FAQ
    Problems from antiquity: trisecting an angle, squaring the circle, duplicating (or doubling) the cube. more>>

  6. The Many Ways to Construct a Triangle - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    In general, a triangle is defined by its three elements. SAS, ASA, and SSS provide three well-known examples but there are many more. Bogomolny provides a table of constructions (linked to constructions) and invites reader contributions. more>>


 

Mason error

error in file:   /usr/lib/perl5/5.6.0/Carp/Heavy.pm
 
line 79:  Bizarre copy of HASH in aassign
context:  
... 
75:  # them according to the format variables defined earlier in
76:  # this file and join them onto the $sub sub-routine string
77:  if ($hargs) {
78:  # we may trash some of the args so we take a copy
79:  @a = @DB::args; # must get local copy of args
80:  # don't print any more than $MaxArgNums
81:  if ($MaxArgNums and @a > $MaxArgNums) {
82:  # cap the length of $#a and set the last element to '...'
83:  $#a = $MaxArgNums;
... 
component stack:   /library/branch.html
/library/dhandler
code stack:   /usr/lib/perl5/5.6.0/Carp/Heavy.pm:79

debug info:   Debug file is '/var/lib/mason/debug/anon/1'.

raw_error





























raw error:
 






























error while executing /library/branch.html:
Bizarre copy of HASH in aassign at /usr/lib/perl5/5.6.0/Carp/Heavy.pm line 79.