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Upside Down?
Author:
Anthony OR 柯志明
Topic:
Circle
A coin is rolling around another fixed identical coin without slipping. If the coin starts with the head up, is the coin head up or down when it is directly opposite to its starting position, as indicated by the dotted circle?
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အခြေခံ data အခေါ်အဝေါ်များ
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คิดเลขเร็ว
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