Math Motivators!: Investigations in Geometry by Alfred S. Posamentier, Gordon Sheridan

By Alfred S. Posamentier, Gordon Sheridan

Math Motivators! a sequence of enrichment investigations in secondary arithmetic, is made of 4 books. They comprise investigations in pre-algebra, algebra, geometry, and enterprise and purchaser arithmetic. every one booklet comprises nearly 32 black-line masters that may be reproduced for scholar use. The investigations probe a large spectrum of mathematical thoughts and functions at numerous degrees.

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Presenting the Investigation If possible, construct Napoleon's figure on the chalkboard before class begins or prepare a construction to use on an overhead projector. Discuss the figure in class, asking students to explain how each construction is done. Although the next relation uses only elementary concepts, most students find it challenging. What seems to be most perplexing is the selection of the correct pair of triangles to prove congruent. If, after a few minutes, students do not find them, tell them to name triangles that use the required segments BD and CF as sides.

Do you' remember the ratio of length to width in agolden rectangle? It's called

_1_ = VS - 1 cp ~ 2 Rectangle CDEF is also a golden rectangle since the ratio oflength to width is cp as shown below. DE=ME -MD EF I DE = ,g - N K The relation between cp and its reciprocal cp' is developed next. 1- ~ = , ....... rs 2+ I DE = H "" 4, AE = AM + ME = Lf \ Presenting the Investigation Briefly discuss the two rectangles at the top of the student page. Point out that the rectangle at the bottom requires a scanning motion in viewing, while the one at the top can be appreciated at one glance.

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