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This Java applet enables students to investigate the area of triangles placed in the first quadrant of a Cartesian coordinate graph. The student selects a level of difficulty, which determines the type of triangle and its orientation on the graph. In addition to it automatically checking student answers, the applet can keep score of correct answers and offers hints by adding to the graph a rectangle that is related to the triangle. From the activity page, What, How, and Why buttons open pages that explain the activity's purpose, function, and how the mathematics fits into the curriculum. Supplemental resources include lesson plans and handouts, as well as exploration questions about finding the area for different types of triangles and the relationship between the area of a triangle and its related rectangle. Copyright 2005 Eisenhower National Clearinghouse
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