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Other side = $\frac{4(2 + \sqrt{3} - 2(1 + \sqrt{3}}{2} \ = 3 + \sqrt 3$
Area = $(3 + \sqrt 3)(1 + \sqrt 3) = (6 + 5 \sqrt 3) cm^2$
raphael answered the question on January 16, 2017 at 09:26
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