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Collected Learning Units in Mathematics

provides more than 200 instructional units in arithmetic, algebra, calculus, data analysis, fractions, geometry, number theory, pre-algebra, pre-calculus, probability, statistics, and trigonometry. The units were developed by teachers attending summer institutes sponsored by the National Security Agency. (National Security Agency)

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Interesting Fact:

The Math and Related Sciences (MARS) Camp is a two-week residential, summer enrichment program for high school and middle school students. MARS provides an array of courses aimed at engaging students in mathematical and scientific problem solving using various innovative techniques.
Question #2 of 'Properties of Parallelograms',... Find the values of AB and x when BC=26, CD=22, and DA=2x+12.

Properties of Parallelograms (PDF)

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