Plane and solid geometry . s, and de-veloped the subject of analyticgeometry, which is known byhis name as Cartesian geome-try. Descartes was born nearTours in France, and was sentat eight years of age to thefamous Jesuit school at LaFleche. He was of good fam-ily, and since, at that time,most men of position entered either the church or the army, he chose thelatter, and joined the army of the Prince of Orange. One day, while walking in a street in a Holland town, he saw a placardwhich challenged every one who read it to solve a certain geometricproblem. Descartes solved it with little diflBcu
Plane and solid geometry . s, and de-veloped the subject of analyticgeometry, which is known byhis name as Cartesian geome-try. Descartes was born nearTours in France, and was sentat eight years of age to thefamous Jesuit school at LaFleche. He was of good fam-ily, and since, at that time,most men of position entered either the church or the army, he chose thelatter, and joined the army of the Prince of Orange. One day, while walking in a street in a Holland town, he saw a placardwhich challenged every one who read it to solve a certain geometricproblem. Descartes solved it with little diflBculty and is said to haverealized then that he had no taste for military life. He soon resigned hiscommission and spent five years in travel and study. After this he liveda short time in Paris, but soon retired to Holland, where he lived fortwenty years, devoting his time to mathematics, philosophy, astronomy,and physics. His work in philosophy was of such importance as to givehim the name of the Father of Modern Descartes 88 PLANE GEOMETRY Proposition XXXIII. Theorem 238. Tim diagonals of a parallelogram bisect eachother.
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