Ta co CD EF DE CF=CD DE EF FC=CC =vt nha nen B ung ri cau C cng tng t nh vy ta sp li. AB AC DC DB =AB BD DC CA =AA=VT vy C cng ung cau D AC BF CE =AE BE CF ta co th bin i v nh sau nh vy cau D k ung au.nu kho hiu thi e co th chng minh = cach chuyn .ABCD is a parallelogram, AD is produced to E such that DE = DC and EC and AB meet in F when produced. Prove that BF = BC..ABCD is a square. E,F,G and H are points on AB,BC,CD and DA respectively, such that AE=BF=CG=DH. Prove that EFGH is square.. DF intersects yhe side AC of a triangle ABC at the point E such that E is the mid point of CA and AEF = AFE. Prove that BD CD = BF CE .
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