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Take a equilateral triangle, divide each side into 4 segments. Then connect the each vertex to division points on the opposite sides as you observe.

InterMath is designed to help middle school teachers deepen their understanding of math concepts...

Using Triangle Geometry, a problem to decide which Coast Guard is closest to a ship is sending an SOS.

National Library of Virtual Manipulatives provides interactive online math lessons, activities, and assessments. Topics include...

Question #2 of 'Properties of Parallelograms',... Find the values of AB and x when BC=26, CD=22, and DA=2x+12.

Collected Learning Units in Mathematics provides more than 200 instructional units in arithmetic, algebra, calculus, data...

 

National Science Foundation

National Science Foundation

National Security Agency
 
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