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|r2| = |a||b|cosx but then should that not be [(2.46/3)^2]cos(30) rather than 2(2.46/3)cos30?

Somewhat embarrassingly as a third year undergrad, this question has been completely stumping me for far too long now (2 hours). The solution is 1.42 Å and the working is given as |r2| = 2cos(30)*1/3(2.46) or alternatively |r2| = (1/2|a|)/cos(30) But I cannot grasp where this comes from...