||User interacts with construction and notices that the triangle constructed under the given conditions "appears" to be a right triangle. He then uses standard 6th grade geometric facts to "prove" that the angle is in fact 90°. Finally, in a second interactivity the user constructs the triangle.
||The sum of the angles of a triangle is 180°, the sum of supplementary angles is 180° the angles at the base of an isosceles triangle are congruent (equal size).
||Understanding triangles, angles and logical conclusions.
||6-9 (6th grade, 7th grade, pre-algebra, geometry)
||Measurement and Geometry, Geometry
||CA 6.MG.2.2, CA Geometry 13.0, ACT PF 24-27
||triangles, medians, right-triangles, construction, interactivity, geogebra
||Suitable for 6th-grade on up. Can be connected to Thale's Theorem on Circles, Diameters and Right-Triangles where the "longest side" is the diameter and the median is any radius.
||Linda Fahlberg-Stojanovska (no copyright)
||Activity and software is free to use
||Zip for offline use: tri_median_right.zip (includes handout, teachers page, 2 ggb interactivities)
Requires freeware GeoGebra for offline use.
||Java Applet so requires free sunJava player