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- 11:49, 10 February 2008 (diff | hist) . . (+236) . . N 2007 AMC 12B Problems/Problem 11 (New page: The angles in a quadrilateral add up to 360, regardless of what shape or size the figure takes. Let x be <A, so then: <B=.5x <C=(1/3)x <D=(1/4)x <A+<B+<C+<D=360 x+.5x+(1/3)x+(1/4)x=360 (2...)
