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thaithithuthao2412
2 năm trước
Để hai tam giác cân bằng nhau thì phải thêm điều kiện là: A. Có cạnh đáy bằng nhau B. Có một cạnh bên bằng nhau C. Có cạnh đáy bằng nhau và góc ở đỉnh bằng nhau D. Có một góc ở đáy bằng nhau và một góc ở đỉnh bằng nhau. Trong một tam giác vuông, kết luận nào sau đây là đúng? A. Tổng hai góc nhọn bằng 180 độ B. Hai góc nhọn kề nhau. C. Hai góc nhọn phụ nhau. D. Hai góc nhọn bù nhau.
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