Cho tam giác LMN nhọn. Vẽ phía ngoài tam giác 3 tam giác đều LMA, MNB, NLC. Chứng minh: LB=MC=NA
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15 tháng 6 2022
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9 tháng 9 2023
a:
góc BAE=góc BAC+góc CAE=góc BAC+60 độ
góc CAD=góc CAB+góc BAD=góc BAC+60 độ
=>góc BAE=góc CAD
Xét ΔABE và ΔADC có
AB=AD
góc BAE=góc DAC
AE=AC
=>ΔABE=ΔADC
b: ΔABE=ΔADC
=>góc ABE=góc ADC
=>góc ABM=góc ADM
Xét tứ giác ADBM có
góc ABM=góc ADM
=>ADBM là tứ giác nội tiếp
=>góc DMB=góc DAB=60 độ
góc DMB+góc BMC=180 độ(kề bù)
=>góc BMC=180-60=120 độ