# math

a girl walks 800 m on a bearing of 129 degrees.calculate how far east and south she is from her starting point.

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1. you will be in the 4th quadrant, 39° down from the x-axis
cos 39° = x/800
x = 800cos39 = 621.7 m east
y = 800sin39 = 503.5 m south

notice :
621.7^2 + 503.5^2 = 639979.1489
√639979.1489 = 799.987 , not bad

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2. cbh

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