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The Law of Cosines shows the affect of the angle between vectors.

R^2 = (A+B)(A +B)*= (AA* + BB* + 2ABcos(AB))

If the angle is less than 90 degrees the resultant squared R^2 is greater than the sum of the vectors squared.

If the angle is 90 degrees the resultant squared is the sum of the vectors squared.

If the angle is greater than 90 degrees, the resultant squared is less than the Sum of the vectors squared.

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Q: How angle between vectors affects the resultant?
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What is the angle between two vectors if their sum is to be maximum?

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When two vectors are added and their magnitude is equal to the magnitude of resultan what will be angle in between them?

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Can the resultant of two vectors of the same magnitude be equal to the magnitude of either of the vector. How?

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The resultant decreases from 0 degrees until the angle is 180 degrees and then increases until 360 degrees.


Can the resultant of two equal vectors be of same magnitude as the two vectors?

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Can the resultant or two vectors of the same magnitude be equal to the magnitude of either of the vectors?

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What should be the angle for the resultant of two vectors to be maximum?

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If a vector of magnitude 3 is added to a vector of magnitude 4 what can the magnitude of the resultant be?

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