That's a rhombus that appears to consist of 4 congruent 30 60 90 triangles. The base of those triangles is 8 and the height would be: tangent (60) = height / 8 height = 8 * tangent (60) height = 8 * 1.7321 height = 13.8568
area of one triangle = 8 * 13.8568 * .5 area of one triangle = 55.4272 area of all 4 triangles =area of the rhombus = 4 * 55.472 = 221.71