標題:

請問有沒有廣設科的人可以教我畫正五邊形?(急!!

發問:

我是廣設科的... 我不會畫正五邊形 能不能在畫圖中不要有 圓 出現(可以有圓 弧 就能畫出正五邊形? 我抄老師的筆記是 1.已知 正五邊形的邊長(20).得線段AB 做線段AB之垂直平分線CD交AB於C 2.在CD點上取F.線段FC等於線段AB.過F點作線段AF 3.在線段AF上取G.線段FG等於線段AC.以A為圓心.線段AG為 半徑畫弧交線段CD於H 4.分別以A.B.H.為圓心.線段AB為半徑畫弧.相交於I.J兩點 5.連接H.I.A.B.J.即為所求 可是我覺得我好像抄錯了 拜託有哪位廣設科人士可以指正我..

最佳解答:

你少做一個動作~就是第四點的地方~ 得I,J兩點後~以I,J為圓心,線段AB為半徑畫弧相交於CD線段得K點 5.連接A,B,J,K,I即為所求 畫了圖給你參考 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIMCmwhG0yfa2rtnekeuek*zkbQiC5zPA4wzoSM 1.已知 正五邊形的邊長(20).得線段AB 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIQCpQhG0yfa2rtnenNScjhyyGX6pwCZLYWz5iA 做線段AB之垂直平分線CD交AB於C 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIUCrwhG0yfa2rtnemoN6UXjqUVXTtqdMj4K8zY 2.在CD點上取F.線段FC等於線段AB. 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIYCuQhG0yfa2rtnesgtS8t8HoNVEUlLUxbVVME 過F點作線段AF 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIcCwwhG0yfa2rtneoa2b1FWyIKvZ5ZfGUWfP9M 3.在線段AF上取G.線段FG等於線段AC. 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIgCzQhG0yfa2rtneuaSjQr4w1bFLKQxx5IBzEQ 以A為圓心.線段AG為半徑畫弧交線段CD於H 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIkC1whG0yfa2rtnerQYUyy!WlDy7PgFhceJsRE 分別以A.B.H.為圓心.線段AB為半徑畫弧.相交於I.J兩點 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIoC4QhG0yfa2rtnehBfCMqeKeT2SAAyVnRgjBI 以J為圓心,線段AB為半徑畫弧相交於CD線段得K點 圖片參考:http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIsC6whG0yfa2rtneosxypfXItcC7F5VZJJdgVI 5.連接A,B,J,K,I即為所求 希望對你有幫助~ 2006-12-11 14:00:18 補充: 圖片都打xx 所以在此貼圖片的連結給你(要把整段網址COPY下來才能看喔) 圖片1 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIMCmwhG0yfa2rtnekeuek*zkbQiC5zPA4wzoSM 2006-12-11 14:01:15 補充: 圖片2 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIQCpQhG0yfa2rtnenNScjhyyGX6pwCZLYWz5iA 圖片3 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIUCrwhG0yfa2rtnemoN6UXjqUVXTtqdMj4K8zY 2006-12-11 14:01:38 補充: 圖片4 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIYCuQhG0yfa2rtnesgtS8t8HoNVEUlLUxbVVME 圖片5 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIcCwwhG0yfa2rtneoa2b1FWyIKvZ5ZfGUWfP9M 2006-12-11 14:02:17 補充: 圖片6 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIgCzQhG0yfa2rtneuaSjQr4w1bFLKQxx5IBzEQ 圖片7 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIkC1whG0yfa2rtnerQYUyy!WlDy7PgFhceJsRE 2006-12-11 14:02:51 補充: 圖片8 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIoC4QhG0yfa2rtnehBfCMqeKeT2SAAyVnRgjBI 圖片9 http://groups.msn.com/isapi/fetch.dll?action=MyPhotos_GetMBPhoto&ImageID=nCgAAAIsC6whG0yfa2rtneosxypfXItcC7F5VZJJdgVI

其他解答:

1.已知 正五邊形的邊長(20).得線段AB 做線段AB之垂直平分線CD交AB於C http://img294.imageshack.us/img294/2136/2560lf3.jpg http://img90.imageshack.us/img90/8909/7303vp1.jpg http://img90.imageshack.us/img90/8113/5088jc4.jpg 2.在CD點上取F.線段FC等於線段AB.過F點作線段AF http://img90.imageshack.us/img90/7180/5912wx1.jpg http://img167.imageshack.us/img167/9846/giq8.jpg 3.在線段AF上取G.線段FG等於線段AC.以A為圓心.線段AG為 半徑畫弧交線段CD於H http://img139.imageshack.us/img139/6602/8552xn8.jpg http://img139.imageshack.us/img139/6002/5615ch9.jpg 4.分別以A.B.H.為圓心.線段AB為半徑畫弧.相交於I.J兩點 http://img141.imageshack.us/img141/861/1835iy3.jpg 5.連接H.I.A.B.J.即為所求 http://img150.imageshack.us/img150/7743/3329mw3.jpg 綠色點點(圓心),藍色點點(找到的點),紅色線(現在進行事),紅色雙箭頭(攫取線段) 應該是這樣~~呵呵 用電腦畫的|||||http://www.wretch.cc/album/show.php?i=zzxxcc0123&b=4&f=1320554216&p=10 這樣應該懂吧. A和最下面那點是 用針 A的右手邊是畫的.... 下面那點往上畫,就會和A 點畫的 相交於一點 A和下面那點 畫一直線,分成五等 (因為五邊形) 在第 2等,和 相交的點又畫一直線.5D8232B72DC99558
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