如图,AB平行于CD,AE垂直于DC,AE=12,BD=15,AC=20,求梯形ABCD的面积
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如图,AB平行于CD,AE垂直于DC,AE=12,BD=15,AC=20,求梯形ABCD的面积
如图,AB平行于CD,AE垂直于DC,AE=12,BD=15,AC=20,求梯形ABCD的面积
如图,AB平行于CD,AE垂直于DC,AE=12,BD=15,AC=20,求梯形ABCD的面积
作BM⊥CD于点M,作BF‖AC,交DC的延长线于点F
则BF=AC=20,
∵AE=12,BD=15
∴BM=9,FM=16
∴AB+CD=9+16=25
所以梯形ABCD的面积=1/2*25*12=150
图呢?
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梯形ABCD的面积=1/2*25*12=150选C
我觉得你应该画一个图的。 要么在描述清楚点