Posted by **Anonymous** on Sunday, March 30, 2008 at 9:04am.

Two vectors 2a+b and a=3b are perpendicular. Find the angle between a and b, if |a| = 2|b|.

- Math -
**drwls**, Sunday, March 30, 2008 at 11:50am
Is a = 3b supposed to be a - 3b? or a + 3b?

If a = 3b is one of the vectors, then you would be saying that a and b are collinear, with |a| = 3|b|. That would contradict your later statement that |a| = 2|b|

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