In GeoCnstr, you draw:
Then, view information, e.g., perimeter, area, or perform operations, e.g., inscribe circle, bisect side.
Keywords: education, learning, geometry, construction
Tap i:Help to view this document as an embedded help book
Draw a line segment, rectangle, square, triangle, circle.
Select an "interesting point" (small square), e.g., vertex, midpoint, to popup information about an object and perform operations, which add "annotations".
Select/(tag)drag to (copy)move/reshape an object. Scrub to erase: annotations (2.x: if any), then object.
A LineSeg displays its midpoint and two endpoints.
Note: currently, y coordinates increase from top to bottom.
A Rectangle displays:
A Square is basically a rectangle with equal sides, with several additional items:
A Circle displays its center:
and a point on the circle:
A Triangle displays many points. For best results, try to make it large and/or non-symmetric. A vertex displays:
A side displays its midpoint:
A triangle has several "centers":
Draw a large, asymmetric triangle.
Select midpoint of each side and bisect; intersection is circumcenter; select circumcenter to draw a circumcircle. Scrub triangle once to erase annotations.
Bisect each angle, draw incircle.
Add Medians from each vertex; intersection is centroid.
Add Altitudes from each vertex; intersection is orthocenter.
NewtonScript version of GeoCnstr is based on Smalltalk code for learning environments I wrote in the mid-'1970s .
GeoCnstr created with NewtDevEnv; it's 1.x/2.x compatible. Help book created from HTML by Newt's Cape. http://members.bellatlantic.net/~sweyer/newton/index.htm
Version 1.0 (11 Mar 1998)
Future: I may add other operations, objects (trapezoids, ellipses). Implement as stationery?
GeoCnstr is freeware, and may be distributed freely as long as all of the files are included and unmodified.
I may make GeoCnstr source available to registered NewtDevEnv users.
© Copyright 1997-98, S. Weyer. All Rights Reserved Worldwide.
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