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29-06-2016
Mathematics

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Find the magnitude and direction of CD for the given coordinates. Round answers to the nearest tenth.
C (8, –9), D (1, –4)

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29-06-2016

CD = <8-1, -9-(-4)> = <7, -5>
[tex]|CD|= \sqrt{7^2+(-5)^2} = \sqrt{74} = 8.6[/tex]
[tex]\theta=\tan^{-1} (\frac{-5}{7})= -35.5\°[/tex]

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