IDENTITY 網站： project-identity.hk 影片內容： 01:16 - 投影 | projection 04:25 - 線與平面的交角 | angle between a line and a plane 05:49 - 兩個平面的交角 | angle between two planes 10:35 - 最大斜率的直線 | line of greatest slope Playlist： HKDSE Maths | 三角學的三維應用 | Application of Trigonometry in 3-D Problems th-cam.com/play/PL1Pv0-rhcQx4I8hovGcsWNeF2vt53_d2n.html
IDENTITY 網站：
project-identity.hk
影片內容：
01:16 - 投影 | projection
04:25 - 線與平面的交角 | angle between a line and a plane
05:49 - 兩個平面的交角 | angle between two planes
10:35 - 最大斜率的直線 | line of greatest slope
Playlist：
HKDSE Maths | 三角學的三維應用 | Application of Trigonometry in 3-D Problems
th-cam.com/play/PL1Pv0-rhcQx4I8hovGcsWNeF2vt53_d2n.html