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March 2, 2015

March 2, 2015

Posted by **Anonymous** on Wednesday, March 20, 2013 at 12:27pm.

- maths -
**Steve**, Wednesday, March 20, 2013 at 2:39pmusing the law of cosines, if we let AD=x,

x^2 + 5^2 - 2x(5)cos30 = x^2 + 25^2 - 2x(25)cos30

25-5x√3 = 625-25x√3

20x√3 = 600

x = 30/√3

x^2 = 300

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