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A high-flying formula
Most of us learned how to use a compass to construct a triangle from the lengths of its three sides. Those three numbers are enough to determine a triangle. But how can we find its area from those data alone? That is precisely what Heron's formula does.

The planispheric astrolabe
The astrolabe is the scientific instrument par excellence! The king of measuring instruments, it ruled supreme for more than a thousand years. It has since lost its former glory, and few people still use it or handle it with nostalgia. Yet it offers a wonderful opportunity to put mathematics into practice.

Diophantus of Alexandria, the unknown: article by… | Tangente
As noted on www.diophante.fr, which has just celebrated its 20th anniversary, the Greek mathematician Diophantus left us some remarkable works on arithmetic. A journey into history will reveal his extraordinary talent.

What is Arabic-Islamic mathematics? | Tangente
Arabic-Islamic mathematics developed against a fascinating historical and geopolitical backdrop, shaped in particular by the importance of the Abbasid dynasty, the role of the House of Wisdom, and diplomatic and intellectual ties with neighboring cultures.
