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## Homework Statement

Sudhir walks 0.40 km in a direction 60.0° west of north, then goes 0.50 km due west. What is his displacement?

## Homework Equations

According to my textbook, the equations are:

Ax = A cos θ

Ay = A sin θ

Bx = B cos θ

By = B sin θ

θ = tan

^{-1}opposite side/adjacent side

Source: http://www.jpopovich.com/file.php/19/phy_chap5.pdf on page 122.

## The Attempt at a Solution

http://screensnapr.com/e/zuQNvk.png [Broken]

Click to see full image.

Both my answers are wrong according to my textbook. Can someone tell me why / explain to me?

The real answer: 0.87km at 77 degrees west

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