If the sum of two diagonals of a diamond is 10cm and the area is 12cm2, the perimeter of the diamond is___ cm.

If the sum of two diagonals of a diamond is 10cm and the area is 12cm2, the perimeter of the diamond is___ cm.

As shown in the figure, from the meaning of the question, BD + AC = 10, 12 · BD · AC = 12, the solution is BD = 4, AC = 6, in RT △ AOB, ab = oa2 + ob2 = 32 + 22 = 13, so the perimeter of the diamond is 413cm. So the answer is 413