標題:
Math 1 question only!!!
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Please see the picture below... ( The question have been type in the picture already) http://img34.imageshack.us/img34/3140/91866127.png THz A lot....
最佳解答:
AB = AC (given) △ABC is an isos triangle. ∠ABC = ∠ACB (base angles of isos triangle) DF//AC (given) ∠DFB = ∠ACB (corr. angles) ∠DFB = ∠ABC △DFB is an isos triangle. (base angles equal) DF = DB (definition of isos triangle) Method 1 : DF = DB = MC (given) DF//MC (given) quadrilateral CDFM is a //gram. (opposite sides equal and parallel) DE = EM (property of //gram) Method 2 : DF = MC ∠DEF = ∠MEC (vert. opp. angles) ∠EDF = ∠EMC (DF//CM alt. int. angles) △DEF and △MEC are congruent triangles (AAS) DE = CM (corr sides) 2009-08-21 19:39:35 補充： There is a typing error in the last line. It should be : DE = EM (corr sides) 2009-08-21 19:39:52 補充： There is a typing error in the last line. It should be : DE = EM (corr sides)
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