If A = (5, 1), B = (1,-3) and C= (2,-4), find the cosine of 2CAB. Let A = (-3, 2), B = (1, 0) and C= (4, 6) be points in the plane. Prove that AABC is a right-angled triangle.

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter11: Rational And Irrational Numbers
Section11.6: The Pythagorean Theorem
Problem 14E
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If A = (5, 1), B = (1, -3) and C= (2,-4), find the cosine of 2CAB.
Let A = (-3, 2), B = (1, 0) andC= (4, 6) be points in the plane. Prove that AABC is a right-angled triangle.
Transcribed Image Text:If A = (5, 1), B = (1, -3) and C= (2,-4), find the cosine of 2CAB. Let A = (-3, 2), B = (1, 0) andC= (4, 6) be points in the plane. Prove that AABC is a right-angled triangle.
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