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標題:
Maths......
發問:
In the figure, AB//CD and BF//DG.ACE,BDE and FGE are straight lines. Find x and y. Ans: x=5, y=9/2 list out the solusion please. 更新: The photo: http://s2.simpload.com/0325460641449d7bf.jpg
最佳解答:
ΔECD ~ ΔEAB [因 CD//AB，及頂角相同] ED / EB = 8 / 12 [相似三角形的對應邊] ΔEGD ~ ΔEFB [因 DG//BF，及頂角相同] ED / EB = DG / BF [相似三角形的對應邊] 8 / 12 = 3 / y [相似三角形的對應邊] y = 36/8 y = 4.5 及 ED / EB = EG / EF [相似三角形的對應邊] 8 / 12 = 10 / (10 + x) 10 + x = 120/8 x = 5
Maths......
發問:
In the figure, AB//CD and BF//DG.ACE,BDE and FGE are straight lines. Find x and y. Ans: x=5, y=9/2 list out the solusion please. 更新: The photo: http://s2.simpload.com/0325460641449d7bf.jpg
最佳解答:
ΔECD ~ ΔEAB [因 CD//AB，及頂角相同] ED / EB = 8 / 12 [相似三角形的對應邊] ΔEGD ~ ΔEFB [因 DG//BF，及頂角相同] ED / EB = DG / BF [相似三角形的對應邊] 8 / 12 = 3 / y [相似三角形的對應邊] y = 36/8 y = 4.5 及 ED / EB = EG / EF [相似三角形的對應邊] 8 / 12 = 10 / (10 + x) 10 + x = 120/8 x = 5
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