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cho tam giác ABC vuông tại A vẽ AH vuông góc với BC tại H biết BC=25cm ,AC =20cm hãy so sánh HB và HC. câu2 bộ ba đoạn thẳng nào sau đây có thể tạo thành tam giác nào A 5 cm,12cm,9cm B 7cm,5cm,2cm C 13cm,8cm,19cm D 10cm,3cm,6cm Câu 3 tìm chu vi của một tam giác cân biết độ dài hai cạnh của nó là 3cm và 1 cm MỌI NGƯỜI GIÚP EM VỚI
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