PQ=1, 则有，半个阴影=以PQ为直径的圆=Pi/4

来源: wxcfan123 于 2022-01-18 10:10:47 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.