關於maths question x2

1) 如果條question 指出 "C is a point on the coastline and C is due west of A. a helicopter O stays at a position 250m vertically above C"
咁 O 係咪 prependicular to CA

Ans: O is perpendicular to CA (since "O stays vertically above C" and CA is on the same plane, therefore OC perpendicular CA)

2)如果個圖上面有兩個方位係平衡 個reason係咪 (AB//CD,parallel line)

Ans: 設AB 及CD 是圖上兩個方位, 若果該兩個方位係平衡, 自然地AB//CD

1. YES.
2.D 是乜. 你無提過