If the perimeter of the diamond is 16cm and the degree ratio of two adjacent angles is 1:2, the area of the diamond is () A. 43cm2B. 83cm2C. 163cm2D. 203cm2

If the perimeter of the diamond is 16cm and the degree ratio of two adjacent angles is 1:2, the area of the diamond is () A. 43cm2B. 83cm2C. 163cm2D. 203cm2

The perimeter of ∵ rhombus is 16cm, the length of ∵ side is 4cm, the degree ratio of adjacent angles of ∵ two phases is 1:2, the ∵ ABC = 60 °, the ∵ ABC is equilateral triangle, the ∵ AC = AB = 4cm, the ∵ OA = 2cm