a) Determine the cosine of the angles of the triangle whose vertices are A(1, –-2, 1), B(3, 0, 2), C(0, 1, –3). b) Determine whether the angle at the vertex A is obtuse or acute. Justify your answer.
a) Determine the cosine of the angles of the triangle whose vertices are A(1, –-2, 1), B(3, 0, 2), C(0, 1, –3). b) Determine whether the angle at the vertex A is obtuse or acute. Justify your answer.
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter9: Real Numbers And Right Triangles
Section9.3: The Pythagorean Theorem
Problem 13E
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Can you help me answer part b?
I already got an answer for part a. I got cos angle = 59.9 or 60.0 degrees
Thank you!
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