The diamond is actually a special parallelogram, and finding its area is actually finding the area of the parallelogram (= base length x height).

Using a graph, the number of adjacent angles is 1:5, and the number of adjacent angles is 30 degrees and 150 degrees respectively, because "the distance of a set of opposite sides" is DH=5CM, and the hypotenuse AD= 10CM of the right triangle ADH can be found by trigonometric function. Since the four sides of the diamond are equal, AB = AD = 65500 cm.