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Solution 4.2:1d

Revision as of 14:10, 8 October 2008 by Tek (Talk | contribs)

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The side marked x is the hypotenuse in the right-angled triangle and the side of length 16 is the adjacent to the angle of 20°.

By writing the quotient for cos20, we obtain the relation

cos20

=x16

and this gives

x=16cos20

(

17.0).