Mathematics, 24.07.2021 17:40 xTrippyBeach4201x

Giúp em câu c và câu d ạ Cho hình thang cân abcd đáy lớn ad, o là giao điểm 2 đường chéo biết góc boc=60 độ gọi I, m,n, p,q theo thứ tự là trung điểm của bc,òa, ob, ab và CD

a, C/m dm vuông góc với ac và cn vuông góc với bd

b, C/m tắm giá mnq là tấm giác đều

c, C/m góc mqp=góc qnd=góc nmc

d, C/m trực tâm h của tấm giác mnq và 2 điểm i, o là 3 điểm thẳng hàng

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Giúp em câu c và câu d ạ Cho hình thang cân abcd đáy lớn ad, o là giao điểm 2 đường chéo biết góc b...