A circle is inscribed in an isosceles trapezoid. Find the relationship of the radius to the sides.

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A circle is inscribed in an isosceles trapezoid. Find the relationship of the radius to the sides.

This is a collection of plates that Leonardo da Vinci created to illustrate De divina proportione of Luca Pacioli.

Considering non-unique representation of Maya calendar numbers may help your students understand their own number system better.

Now there are three sisters who leave home together.

A general formed his men into a square, that is, an equal number in rank and file, and he found that he had an excess of 59 men.

This is the title page of the Nova Scientia (1537) of Niccolo Tartaglia (1499-1557). In this work, Tartaglia discussed the mathematics of artillery and developed methods for determining the range of a cannon.

The sum of two numbers is 10 and their product is 40. What are the numbers?

In a square box that contains 1000 marbles, how many will it take to reach across the bottom of the box in a straight row?

A fellow said that when he counted his nuts by twos, threes, fours, fives and sixes, there was still one left over; but when he counted them by sevens they came out even. How many did he have?

A history of the various algebraic structures that came together to give us "abstract algebra" by early in the twentieth century.