Mathematics, 14.08.2021 04:30 mildred3645
Cho tam giác ABC. Ba trung tuyến AM ; BN; CP cắt nhau tại G .Trên tia GM lấy điểm D sao cho MD = MG ,trên tia GN lấy điểm E sao cho NE = NG và trên tia GP lấy điểm F sao cho PF = PG.
a) Chứng minh ∆ ABC = ∆ DEF
b) Chứng minh rằng G là trọng tâm của tam giác DEF
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Cho tam giác ABC. Ba trung tuyến AM ; BN; CP cắt nhau tại G .Trên tia GM lấy điểm D sao cho MD = MG...
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