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!

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.
Transcribed Image Text: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.
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