# I don't get scalar product?

## Homework Statement

Find the scalar product of the 2 vectors.
Vector A is north of east at 70 degrees with a magnitude of 3.60m
Vector B is south of west at 30 degrees with a magnitude of 2.40m

ABcosx

## The Attempt at a Solution

I did dot product using the formula, 3.60x2.40xcos(-100) and got the wrong answer.. The answer is 13.00. What the hell did I do wrong? I did as the formula said I should do and failed. I don't get it??

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## Answers and Replies

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tiny-tim
Science Advisor
Homework Helper
Vector A is north of east at 70 degrees …
Vector B is south of west at 30 degrees …

I did dot product using the formula, 3.60x2.40xcos(-100) …
Hi elpermic!

It ain't 100.

Doc Al
Mentor
I did dot product using the formula, 3.60x2.40xcos(-100) and got the wrong answer.. The answer is 13.00.
(1) The formula calls for the angle between the two vectors. That angle is not 100°. (Draw a diagram.)
(2) The answer cannot be 13.