如圖，在直角坐標平面上，ABCD為平行四邊形，已知A(1 , 6)，B(a , b)，C(8 , －6)，D(7 , 6)，若平行四邊形ABCD的面積為72，則坐標(a , b)為何？ (A)(

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22.如圖，在直角坐標平面上，ABCD為平行四邊形，已知A(1 , 6)，B(a , b)，C(8 , －6)，D(7 , 6)，若平行四邊形ABCD的面積為72，則坐標(a , b)為何？

(A)(2 , －6)　
(B)(－6 , 2)　
(C)(－2 , 6)　
(D)(6 , －2)

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