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darkangel832001
2 năm trước
Bài 9. Một đĩa đu quay hình tròn, bán kính 5m. Bé Hoa được mẹ cho chơi đu quay. Em cưỡi con hổ gỗ đi 25 vòng. Hỏi: a) Chu vi đĩa đu quay là bao nhiêu mét ? b) Bé Hoa cưỡi con hổ đi được đoạn đường dài bao nhiêu mét ?
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