如图,四边形ABCD的两条对角线AC、BD互相垂直,A 1 B 1 C 1 D 1 是四边形ABCD的中点四边形,如果AC=8,BD=10,那么四边形A 1 B 1 C 1 D 1 的面积为( )
A.
20
B.
40
C.
36
D.
10
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