Mathematics, 17.06.2021 22:10, mathfan5049

Cho tứ giác abcd, các phân giác trong góc A, góc B cắt nhau tại I, các phân giác ngoài của góc A cắt nhau tại E. Chứng minh góc AIB=góc BCD+góc CDA/2;gócAEB=góc BAD+góc ABC/2

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Cho tứ giác abcd, các phân giác trong góc A, góc B cắt nhau tại I, các phân giác ngoài của góc A cắt...