請解答2條問題, 要有步驟, 謝謝! http://i1262.photobucket.com/albums/ii606/lemonyeung/question1.jpg?

2015-10-01 3:29 am
更新1:

螞蟻雄兵: 1) 唔明點解點出呢條式 (72+2*72)/2=108 2) SQ?=(12+3)

更新2:

2) SQ=12+3 明左啦, 淨係第一條唔明

回答 (1)

2015-10-01 3:46 am
✔ 最佳答案
1
360/(2+1+1+1)=72
(72+2*72)/2=108
(A)

2
連接TP
TP為直徑
TP^2+(PQ-ST)^2=SQ^2
(2r)^2+(12-3)^2=(12+3)^2
4r^2=144
r=6
(B)


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