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Mathematics, 25.07.2021 19:20 destinywashere101

Cho tam giác ABC vuông tại A có góc C=30độ, vẽ AH vuông góc với BC (H thuộc BC) trên tia đối của HA ,lấy điểm D sao cho HA=HD a) chứng minh tam giác ACH=tam giác DCH, tính góc DCH b) trên tia HC lấy điểm E sao cho HE=HB, chứng minh DE vuông góc với AC

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Cho tam giác ABC vuông tại A có góc C=30độ, vẽ AH vuông góc với BC (H thuộc BC) trên tia đối của HA...
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