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- 20 14 Dezhou city middle school entrance examination mathematics twelfth question
20 14 Dezhou city middle school entrance examination mathematics twelfth question
The graph is like this, BF+AF=8, AB=4, Pythagorean theorem can calculate BF=3, AF=AE=5, the area of the diamond is 20, and a diagonal line is
Quadruple root number 5, use diagonal area formula to calculate EF=2 times root number 5.
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