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National Library of Virtual Manipulatives

provides interactive online math lessons, activities, and assessments. Topics include fractions, functions, geometric transformations, integer arithmetic, patterns and sequences, probability, right triangle trigonometry, slope, triangle geometry, and writing equations of lines. Calculate what an excavation company should charge for digging a hole. Analyze three pollution reduction plans. Determine the best rate for repaying a loan. (Utah State University, National Science Foundation)

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Interesting Fact:

The Golden Rectangle is a plot created by starting with a rectangle, chopping off successive squares, and drawing quarter circles with a radius equal to the side of the square that was cut.
Using Triangle Geometry, a problem to decide which Coast Guard is closest to a ship is sending an SOS.

Triangle geometry -- ship at sea

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