1. 呢一題c既答案點解係49.4? 可唔可以比steps我?
圖片參考：http://imgcld.yimg.com/8/n/HA00627139/o/701108260084713873449300.jpg
2. find x and y
圖片參考：http://imgcld.yimg.com/8/n/HA00627139/o/701108260084713873449311.jpg
3.tan15 =1/(2+√3)
點變左 tan15=2-√3 ??
f.3 maths~urgent plz help15pts
2011-08-27 1:34 am
回答 (1)
2011-08-27 2:19 am
✔ 最佳答案
1. let (angle)XQY be ytan y = 200/QY
y =49.4 (corr. to 3 sig fig)
PS. QY = answer of b2. AE = AD = DE (PROP. OF EQUIL. TRI.)
AD = AB = BC = DC (PROP. OF SQ.)
(TRI.)EDC IS ISOS. TRI.
x = (ANGLE)DCE (PROP. OF ISOS. TRI.)
(angle)DEC = 90 + 60
x = (180 - 150)/2
x = 15 (ANGLE)AED = 60 (PROP. OF EQUIL. TRI.)
Y = (60/2) - x
y = 15
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