4.2 Triangle Angles

Triangle Angle-Sum Theorem This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com 1. Use the slider to make the angles of the triangle lie on the straight line. Make a conjecture about the sum of the angles in a triangle. 2. Use points A, B, and C to change the triangle. Now use the slider again to make the angles of the triangle lie on the straight line. Is your conjecture from question #1 always true? Barbara Perez, 10/30/06, Created with GeoGebra

LESSON NOTES
https://docs.google.com/presentation/d/1XrIGsT1FIJkHZDdZPb2ZHbc2A0ntT3BFPWX4urwR8u0/edit