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Answer:16 units²Step-by-step explanation:Diagonal AC is a vertical line extending from y=0 to y=4, so is 4 units long.Diagonal BD is a horizontal line extending from x=-5 to x=3, so is 8 units long.The area of a rhombus is half the product of the lengths of the diagonals, so ...A = (1/2)(4 units)(8 units) = 16 units²The area of rhombus ABCD is 16 units²....