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Given a pendulum as shown. The height of the pendulum is two units and its horizontal width is 2 units. What is the area of the pendulum?
A wonderful survey of the history of mathematics, emphasizing its relationship with the ambient culture.
A book delving into the working of the mathematical mind.
A compilation of ethnomathematical ideas from around the world.
The annual meeting of the NCTM always contains sessions dealing with the history of mathematics and its use in teaching.
A letter to Sam Greitzer, late editor of Arbelos, discussing the derivation of two formulas for calculating pi.

How Euler resolved the paradox first noted by Maclaurin that nine points should determine a curve of order three, yet two such curves can intersect in nine points

A great book from which to learn and teach the subject of relativity.
Page from al-Khwarizmi's algebra text written in about 825. The proof of the rule for solving a quadratic equation of the form "squares plus roots equal numbers".
The steamer, Katie, leaves the wharf at New Orleans and runs an average speed of 15 mph. When Katie had gone 25 miles, the steamer R.E. Lee leaves the wharf and runs the average speed of 18 mph. How far will the Lee go before she overtakes the Katie?