Ask questions to the underlined words and phrases. 1. At Leiden, Snel prepared a Latin translation of Stevin’s Wisconstighe Ghedachtenissen, which was then being published.
2. He also busied himself with the restoration of the two books of Apollonius on plane loci, preserved only in abstract by Pappus.
3. In 1608 Snel married Maria De Lange, daughter of a burgomaster of Schoonhoven; only three of their eighteen children survived.
4. The Doctrina, which comprise a plane and spherical trigonometry, includes the recession problem for two points, often named after P. A. Hansen (1841).
5. Descartes has been accused of plagiarism (for example, by Huygens), a fact made plausible by his visits to Leiden during and after Snel’s days, but there seems to be no evidence for it.

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