Vectors

**classicstrings** · November 12th 2006, 02:28 AM

Vectors a and b are such that the magnitude of a = magnitude of b and the angle between a and b is 40 degress. The angle between vectors a and a + b is?

Thanks for the help!

**earboth** · November 12th 2006, 02:40 AM

Originally Posted by classicstrings

Vectors a and b are such that the magnitude of a = magnitude of b and the angle between a and b is 40 degress. The angle between vectors a and a + b is?

Thanks for the help!

Hello, classicstrings,

do the addition of vectors geometrically. Because $\|{\vec{a}}=\|{\vec{b}}$ you'll get a rhombus. Thus the vector $\vec{a}+\vec{b}$ bisect the angle. So the value of the angle you are looking for is 20°.

EB

**classicstrings** · November 12th 2006, 03:08 AM

dankeschön! My german exam is tommorrow

, then maths on Wednesday, then chinese on thursday!

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