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Arial, sans-serif" text-anchor="left" xml:space="preserve" transform="matrix(0.8335500359535217,0,0,0.8709677457809448,46.10664004087448,32.516128063201904) " stroke="000">F</text> </line></line></line></line></line></line></line></line></line></line></line></line></line></line></line>Ta có hình vẽ trên: Xét 2 tam giác vuông MBE và tam giác MCF có: BM = MC (gt) góc M1 = góc M2 (đối đỉnh) suy ra tam giác MBE = tam giác MCF (cạnh huyền - góc nhọn) suy ra BE = CF (2 cạnh tương ứng) Vậy BE = CF |
