Use the law of cosines to show that, if a2 =b2  +c 2 , then A = 90 degree.

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter75: Drilling And Boring Compound-angular Holes
Section: Chapter Questions
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Use the law of cosines to show that, if a2 =b2  +c 2

, then A = 90 degree.

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