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The author became fascinated with the mysterious role of √-1 in electronics. Turning to history for insight, he brings the perspectives of both a practical man and a scholar in conveying the enchantment of mathematics for a non-mathematician.
Suppose General [George] Washington had 800 men and was supplied with provisions to last 2 months but he needed to feed his army for 7 months.
The cavity of our chimney is an upright parallelepiped, the diagonal of whose base is 60"; and the height of the lower side of the lintel above the plane of the floor is 40".
These are the winning entries from the annual History of Mathematics SIGMAA Student Paper Contest.
There is much to see in this museum related to the history of mathematics.

The "rood", a linear measure dating from many centuries ago, is calculated anew in today's classrooms.

A tree 100 units high is 200 units distant from a well; from this tree one monkey climbs down and goes to the well...
Problems taken from Chinese sources
Find two number with sum 20 and when squared their sum is 208.
If an equilateral triangle whose area is equal to 10,000 square feet be surrounded by a walk of uniform width, and equal to the area of the inscribed circle, what is the width of the walk?