Visual aid and manipulative for demonstrating geometric and trig

Details Visual aid and manipulative for demonstrating geometric and trig Visual aid and manipulative for demonstrating geometric and trig

1996-06-20

1998-03-31

Fulton, Christopher W.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33114, 33456, 33471, 33465, B43L 710, G01B 524

Patent

active

057324743

ABSTRACT:
The present invention herein called "LABEs", comprises a manipulative for assisting students in the visual understanding of the relationships of all angles in a rectangle, triangle, or other such geometric shapes relative to their side lengths, thus allowing the student to prove theorems used in the teaching of geometry. The manipulative further comprises a disk having indicia representing a 360 degree compass, the disk having a first fixed leg, bearing indicia in units of length, extending from the disk at a point adjacent the zero degree indicia mark, and a second leg, having a sleeve portion, which is pivotally attached to the center of the disk by a snap grommet, the sleeve portion being capable of accepting the fixed leg of a second LABE in a longitudinal, adjustable manner therein.

REFERENCES:
patent: D342685 (1993-12-01), Stokes
patent: 662977 (1900-12-01), Schmelz
patent: 1129081 (1915-02-01), Edmonds
patent: 2460713 (1949-02-01), Richardson
patent: 3766652 (1973-10-01), Gomez
patent: 4872267 (1989-10-01), Anderton
patent: 5020233 (1991-06-01), Syken
patent: 5113590 (1992-05-01), Shapiro et al.
patent: 5117560 (1992-06-01), Nevins
patent: 5412875 (1995-05-01), Hilderbrandt

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