Two questions on basic angles i.e given a circle, a few chords or diameter
據說是 Microsoft 公司 interview 時的問題!!! 有兩間屋,甲和乙,甲屋有三個開關,乙屋有三個燈泡, 甲屋是看不到乙屋,而甲屋的
In a square, all the mid points are joined. The inner square is shaded.