Math E-320:
Teaching Math with a Historical Perspective
Mathematics E-320:
Instructor: Oliver Knill
Office: SciCtr 434

The proof that the altitudes hit in a common point. The proof reduces it to the fact that the perpendicular bisectors intersect in a common point. Credit: I owe this remark to Cody Patterson, who learned it from a student of his.
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Math E320| Oliver Knill | Spring 2010 | Extension School | Harvard University