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Thanhthuy20
2 năm trước
Cho tam giác ABC có góc A bằng độ ( AB < AC ) . gọi M là trung điểm của BC . Kẻ MH vuông góc với AB tại H và MK vuông góc với AC tại K . a) C/m tứ giác AHMK là hình chữ nhật b) gọi P là điểm đối xứng của M qua H C/m H là trung điểm của AB và APBM là hình thoi c) AC=8cm, Ab = 6 cm tính S APBM ?
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