Posted by **Shaila** on Monday, August 9, 2010 at 9:06am.

consider a rhombus ABCD

a) find the resultant of vector AB + vector AD and vector AB - vector AD? (cosine rule)

b) What will be the value of the dot product of vector AB + vector AD and vector AB - vector AD always be? (always zero)

c) Is this value of the dot product of vector AB - vector AD dot product vector AB + vector AD (commutative property)

Can someone please check if the answers in the brackets are correct!!!

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