In a rectangular coordinate system, what is the area of a rhombus whose vertices have the coordinates (0, 4.5), (8, 0), (0, -4.5), (-8, 0)?
Choose one
A) 56
B) 72
C) 112
D) 116
E) 120

Rationale: "ares of rhombus = 1 / 2 * d 1 * d 2 length of 1 st diagonal = 8 + 8 = 16 length of 2 nd diagonal = 4.5 + 4.5 = 9 area = 1 / 2 * 16 * 9 = 72 b is the answer"
Answer: B