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 Grades 3–5 Standards This applet allows for the exploration of the area of rectangles. How do you find the area of a triangle? Become confident in facts up to 12 x 12 using visual models that stress the conceptual aspects of multiplication. Grades 6-8 Standards Handshakes In general, how many handshakes occur when there are n people? Explore when an isosceles triangle obtains its maximum area. Why is c2=a2+b2? Review and explore the Pythagorean Theorem. Investigate how changes in the scale factor influence the ratio of perimeters and the ratio of areas between two figures. Grades 9-12 Standards This interactive demonstrates how to bisect an angle. Discover and explore Euler's Line. This applet allows for the discovery of the incenter and incircle of a triangle. What, if any, relationships can you identify among the segments (for each chord) and radius? Why is ? This applet allows for the construction and exploration of the Simson Line. Where should a soccer player be placed so that she has the best chance of making a goal?