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June 22nd, 2015, 03:35 AM   #1
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A question on Unit Vectors, please help

Let a and b be two unit vectors and p is the angle between them. Then a+b is a unit vector of:

1. p = pi/3

2. p = pi/4

3. p = pi/2

4. p = 2pi/3
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June 22nd, 2015, 05:02 AM   #2
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Have you tried answering it yet? Have you drawn a diagram with some unit vectors on it?
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June 22nd, 2015, 12:54 PM   #3
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Notice that a,b,a+b form an equilateral triangle.
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