圖片參考：http://imgcld.yimg.com/8/n/HA04937267/o/701204020054113873387030.jpg
計左成日都計唔到e條-.-...
搵人幫幫手,thx
更新1:
ps,CIRCLE既prop入面, 淨係比用 chord:(我諗唔會用到= =) line from centre⊥chords bisects chord line from centre to mid-pt. of chord ⊥ chord equal chords,equidistant from centre chords equidistant from centre are equal
更新2:
angle: < in semicircle < at centre twice < at circumference
更新3:
angle: < in semicircle < at centre twice < at circumference
更新4:
converse of < in semicircle
更新5:
同埋
更新6:
angles in the same segment
更新7:
超勁=.=thx
