Question

如图 BC=8cm,AH⊥BC,AH=5cm,BD=DC,BE=AE,AF=FD求△DEF的面积

Answer 1

AF=FD,S△ADE=2S△DEF

BE=AE,S△ABD=2S△ADE=4S△DEF

BD=DC,S△ABC=2S△ABD=8S△DEF

5*8/2=8S△DEF

S△DEF=5/2 平方厘米