陰影ABFE麵積=ABCE麵積-[BCF麵積+EFC麵積]
=[ABC麵積+ACE麵積]-[BCF麵積+FFC麵積]
=[ACE麵積-BCF麵積]
(因為 ABC麵積=EFC麵積)
陰影ABFE麵積=ABCE麵積-[BCF麵積+EFC麵積]
=[ABC麵積+ACE麵積]-[BCF麵積+FFC麵積]
=[ACE麵積-BCF麵積]
(因為 ABC麵積=EFC麵積)
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