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A combined set of interacting instruments for constructing and analyzing mathematical figures includes a ruler, an adjustable triangle assembly, a compass and a protractor. The ruler includes an elongated strip of rigid or semi-rigid plastic having a length, width and relatively thin thickness. A pi

A combined set of interacting instruments for constructing and analyzing mathematical figures includes a ruler, an adjustable triangle assembly, a compass and a protractor. The ruler includes an elongated strip of rigid or semi-rigid plastic having a length, width and relatively thin thickness. A pivot point is provided in a general middle portion of the ruler together with three parallel longitudinally extending guideways along portions of the ruler. One of the guideways includes a positioning hole for a writing instrument to act as a compass. The triangular assembly includes two moveable elements having first and second ends with the two elements pivotally connected together at one end of each of the elements so they can be disposed in an end to end relationship. The moveable elements also have a guide follower that fits within one of the guideways in the ruler. A protractor is also made of a thin sheet of plastic material and has a generally flat base portion and arcuate upper portion with angular indications between 0 and 180° marked on the base and upper portions. The protractor also includes a pair of guide followers for positioning within a second of said longitudinally extending guideways.

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1. A combination set of interacting instruments for construction and analyzing two dimensional mathematical figures, said combined set of interacting instruments comprising: a ruler, an adjustable triangle assemble with variable included angles, a compass and a protractor fixed to said ruler, and wh

1. A combination set of interacting instruments for construction and analyzing two dimensional mathematical figures, said combined set of interacting instruments comprising: a ruler, an adjustable triangle assemble with variable included angles, a compass and a protractor fixed to said ruler, and wherein;said ruler comprising an elongated strip of relatively rigid transparent plastic material having a length, width, and relatively thin thickness and said ruler defining a straight edge along one side of said width and extending along said length with units of length marked thereon, a pivot point in a generally middle portion of said ruler in which said pivot point extends through said ruler and includes a pointed end for anchoring said ruler and a pair of parallel longitudinally extending guideways and said ruler also including a third guideway parallel with said two guideways along the length of said ruler between said pivot point and one end thereof and a sliding positioning hole disposed in said third guideway for positioning a marking instrument rotatable about said pivot point to act as a compass; and in which said guideways in said ruler are slots extending through said ruler and said guide followers are relatively short pins that extend into said slots;a triangular assembly including two moveable elements for forming two sides of a triangle and having first and second ends with said two moveable elements pivotally connected together at one end of each of said moveable elements whereby said moveable elements are disposed in an end to end relationship with an included angle of up to 180° along said straight edge of said ruler and each of said two moveable elements including a guide follower at an opposite end from said pivot connection between said two moveable elements and said guide follower interacting with one of said two guideways in said ruler for forming a triangle with one side of said triangle formed by said straight edge of said ruler; and which includes a longitudinally extending slot in one of said moveable elements that extends from said pivotal connection between said two moveable elements along the length of said element for shortening one side of said triangle; and in which said triangular assembly is permanently connected to said ruler; andsaid protractor comprising a thin sheet of said transparent material having a flat base portion and an arcuate upper portion with angular indications between 0 and 180° on said base portion and said upper portion and said protractor including a pair of guide followers at opposite ends of said base portion for positioning said protractor on said ruler along the length thereof and for measuring the included angle between said ruler and each of said moveable elements; andin which said protractor includes three parallel arc shaped grooves in an upper portion thereof. 2. A combined set of interacting instruments for constructing and analyzing two dimensional mathematical figures, said combined set of interacting instruments consisting of: a ruler, an adjustable triangle assemble with variable included angles, a compass and a protractor, and wherein;said ruler consists of an elongated strip of rigid or semi-rigid transparent material having a length of between about 12 and 18 inches (30.48 and 45.72 cms), a width of about 1 to 2 inches (2.54 and 5.08 cms) and a thickness of between about 1/16 and 3/16 inch (about 0.16 to 0.48 cm) and said ruler defining a straight edge along each side of said width with inches of length marked on one side and centimeters indicated on the opposite side, a pivot point including a relatively sharp point extending through a generally middle portion of said ruler with a pointed end to fix said pivot point to a backing and a pair of parallel longitudinally extending selected guideways parallel with one of said straight edges and a third slotted guideway parallel to said pair of guideways but extending between said pivot point and one end of said ruler and a sliding positioning hole disposed in said third guideway for positioning a marking instrument that rotatable about said pivot point to act as a compass;a triangular assembly including two moveable elements for forming two sides of a triangle and each of said moveable elements having first and second ends with said two moveable elements pivotally connected together at one end of each of said moveable elements whereby said moveable elements are disposable in an end to end relationship with an included angle therebetween of up to 180° along one of said straight edges of said ruler and each of said moveable elements including a guide follower at an opposite end from said pivot connector between said moveable elements and said guide followers interacting with and permanently fixed within one of said two guideways in said ruler for forming a triangle with one side of said triangle formed by said straight edge of said rule;said protractor comprising a thin transparent sheet of rigid or semi-rigid plastic having a flat base portion and an arcuate upper portion with angular indications between 0 and 180° in said base portion and said upper portion of said protractor including a pair of guide followers at opposite ends of said base portion for fitting into said second of said pair of guideways for measuring the included angle between said ruler and each of said moveable elements; andboth of each moveable elements including a longitudinally extending slot connected to said pivot connector between said moveable elements to shorten two sides of said triangle.