Re: [中學] 想請問這題證明
延長AM至I,使△BMI = △CMA
∠ABI = 180 - ∠BAC = ∠EAG
=> △ABI = △EAG
=> ∠AEG = ∠BAI
B對AM作垂足J(J有可能和M重合,但不影響證明)
∠EAH = 90 - ∠BAJ = ∠ABJ
=> △EAH = △ABJ
=> MA ┴ EG
原命題得證
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