Question

時(shí)鐘的時(shí)針在不停地旋轉(zhuǎn)，從上午6時(shí)到上午9時(shí)，時(shí)針旋轉(zhuǎn)的旋轉(zhuǎn)角是______度（填度數(shù)）．

Answer 1

從上午6時(shí)到上午9時(shí)，共3個(gè)小時(shí)；時(shí)針旋轉(zhuǎn)了

1

4

圓周，故旋轉(zhuǎn)角是90度．