This is a prototype of JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright ©1990-1998 by Key Curriculum Press, Inc. All rights reserved. Portions of this work were funded by the National Science Foundation (awards DMI 9561674 & 9623018).

parlines.gif (1476 bytes)

Before the next rules can apply, there must be two parallel lines (p & q) and a transversal (t).

symbols:

< angle     @ congruent
oppangles.gif (1708 bytes)

Corresponding angles are on the same side of the transversal t..

Left side of transversal t:

<1 @ <5 and <3 @ <7

Right side of transversal t:

<4 @ <8 and <2 @ <6

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• Drag the points A, B, D, and F. • Compare the measure of the two "blue" angles. • Compare the measure of the two "red" angles. • Are there other pairs of corresponding angles?

Geometer's Sketchpad source:  http://www.geom.umn.edu/~dwiggins/mainpage.html