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    # 數學再出發 ## 第一次作業 ### 第一堂課 #### __認識 Geogebra 基本工具__ ![](https://i.imgur.com/NxbupqY.png) 1. 第一個為移動或拖曳點選物件 2. 第二個物件可以在圖上標點 3. 第三個可做線段 4. 第四個可做垂直線 5. 第五個可做多邊形圖形 #### __繪製基本圖形__ ##### 實作1題目 已知一平行四邊形的三頂點為(3,2),(1,3),(-1,4),試畫出第四個頂點座標? - **step1** *在平面上做出三點* 1. 直接在平面上點座標 2. 在指令列輸入座標 ![](https://i.imgur.com/b5MR6Bu.png) >Note *Geogebra 中,大寫的英文字母表示點,小寫英文字母可能表示向量,線段或數值。* - **step2** *將題目三點連線* 1.點選![](https://i.imgur.com/W9WmqVe.png) (線段),任兩點連線 - **step3** *將第四個頂點畫出* 1.利用平行線畫出交點 ![](https://i.imgur.com/UJiBdh9.png) ##### 延伸 1. *利用 ![](https://i.imgur.com/wV4dSrh.png)(多邊形)做出此平行四邊形* 2. *使用 Polygon(<Point>,...,<Point>) 指令做出平行四邊形* ##### 成品 ![](https://i.imgur.com/5J84m9M.png) ##### 代數區 ![](https://i.imgur.com/iIRz8gz.png) ### 第二堂課 #### 繪製基本圖形 ##### 實作2題目 ![](https://i.imgur.com/tGY72Z2.png) ##### 成品 ![](https://i.imgur.com/UNG9bKY.png) ##### 操作介紹 ###### 重心 重心為三條中線的交點 ![](https://i.imgur.com/xsg6gxO.png) >Note 利用![](https://i.imgur.com/u6d7gVQ.png)與![](https://i.imgur.com/ha69bce.png)做出重心 ###### 垂心 垂心為三角形三邊高的交點 ![](https://i.imgur.com/1vOTHXz.png) >Note 利用![](https://i.imgur.com/vXji9pi.png)做出垂心 ###### 內心 內心為三角平分線交點 ![](https://i.imgur.com/6AfpGMK.png) >Note 利用![](https://i.imgur.com/AHOGGUz.png)做出內心 ###### 外心 外心為三邊中垂線交點 ![](https://i.imgur.com/u4b7v52.png) ###### 歐拉線 歐拉線為外心、重心、垂心的連線 ![](https://i.imgur.com/s2G69tL.png) >Note 利用![](https://i.imgur.com/h7GStxJ.png)與剛剛做出的三點連線段 ### 第三堂課 #### 鏡射練習 ![](https://i.imgur.com/n2u2FKE.png) >指令 ![](https://i.imgur.com/bWG2Xgd.png) ![](https://i.imgur.com/Vg6W6zF.png) >指令 ![](https://i.imgur.com/0UNxoXu.png) ![](https://i.imgur.com/YIlDQE2.png) >指令 ![](https://i.imgur.com/26YWhZF.png) ![](https://i.imgur.com/7bmbOXN.png) ### 第四堂課 #### 103學測題作圖 ##### 題目 ![](https://i.imgur.com/NwBz0eo.png) ##### 操作說明 - step1 利用![](https://i.imgur.com/SbMeZmu.png)做出長度為1的線段 - step2 利用剛剛做出的線段加上![](https://i.imgur.com/e8yjwtD.png)工具做出一正三角形 ![](https://i.imgur.com/qemhO04.png) - step3 使用![](https://i.imgur.com/rcpo8n7.png)==逆時針==旋轉三角形的三個角15度 ![](https://i.imgur.com/oIhp9Nb.png) ![](https://i.imgur.com/nvGgbau.png) ![](https://i.imgur.com/f2kBDWc.png) - step4 利用![](https://i.imgur.com/ZOQ7qV5.png)分別做出 D E F 三點 ![](https://i.imgur.com/oB72nFO.png) ![](https://i.imgur.com/r1oNvTe.png) ![](https://i.imgur.com/rrgANa4.png) - step5 隱藏所有多餘三角形留下最初的三角形與剛剛做出的 D E F 三點 ![](https://i.imgur.com/kaxOmS0.png) - step6 利用![](https://i.imgur.com/DlKP0Lr.png)連接 AE BF CD 線段 ![](https://i.imgur.com/s7t9sdM.png) #### 成品 ![](https://i.imgur.com/DRqWFQW.png) ## 第二次作業 ### 第五堂課 #### 麻之葉-正六邊形 ##### 範例 ![](https://i.imgur.com/EaSVLc0.png) ##### 操作說明 - step1 畫一圓 C & 圓心 ![](https://i.imgur.com/TmjU8vp.png) - step2 畫出直徑 ![](https://i.imgur.com/qjmmRRA.png) - step3 利用![](https://i.imgur.com/tOFNNJ1.png)將圓分成六等分 ![](https://i.imgur.com/aJx90G7.png) - step4 利用![](https://i.imgur.com/cB5vDO5.png)做出中點 ![](https://i.imgur.com/dkJ3msW.png) - step5 利用![](https://i.imgur.com/lqA5b3a.png)將圖形做成下圖 ![](https://i.imgur.com/pTJNfmv.png) - step6 將中點連起來 ![](https://i.imgur.com/Gx7uGxz.png) - step7 將圖形連成下圖 ![](https://i.imgur.com/7t3jUVV.png) ##### 成品 ![](https://i.imgur.com/8c7CCvO.png) ### 第六堂課 #### 圓在直線上旋轉 ##### 操作說明 - step1 做一直線並且在上面畫一個圓 ![](https://i.imgur.com/gUUgEJN.png) - step2 做第二個圓並且連接一線段 k ![](https://i.imgur.com/Blpx87r.png) - step3 在指令區輸入一段指令 ![](https://i.imgur.com/78upyaR.png)使作出的 F' 與 F 之線段與 k 等長 ![](https://i.imgur.com/k1FdtVl.png) - step4 連接 F 到 F' 的線段,並利用![](https://i.imgur.com/FWQxOw0.png)做出一扇形 ![](https://i.imgur.com/QI1uxhr.png) ##### 成品 {%youtube gHmP98yxMps %} ### 第七堂課 #### 圓在圓上旋轉 ##### 操作說明 - step1 以原點為圓心做一圓 ![](https://i.imgur.com/qnjuX1Q.png) - step2 在(6,0)做一點 B ,並連接 D B 做一向量 ![](https://i.imgur.com/KVIemX4.png) - step3 以 B 為圓心 3 為半徑做一圓 ![](https://i.imgur.com/2Jz01kp.png) - step4 做一個角度的數值滑桿 α ![](https://i.imgur.com/u1eHzF4.png) - step5 以 D 為起點 3 為長度並且角度為 α 的向量 ![](https://i.imgur.com/ZvnvkL7.png) ##### 成品 {%youtube A8T2w4qjrI4 %} ### 第八堂課 #### 三圓繞圓心同時公轉及自轉 ##### 操作說明 - step1 在圓點做一點 A ![](https://i.imgur.com/vMiVBBk.png) - step2 設一數值滑桿 α ![](https://i.imgur.com/b3YpOY5.png) - step3 在代數區打![](https://i.imgur.com/vaYXFMs.png)做一點 C ![](https://i.imgur.com/Dzty5Ch.png) - step4 利用 Rotate 指令做出另外兩個圓上的一點![](https://i.imgur.com/WISqGOy.png) 分別為 C1 C2 ![](https://i.imgur.com/i8lrF1x.png) - step5 做出三個圓(分別通過 C C1 C2) ![](https://i.imgur.com/ffDup2t.png) - step6 再做出與上個步驟三個圓相互連接的三圓 ![](https://i.imgur.com/1oFjQWd.png) - step7 連接出三線段 ![](https://i.imgur.com/YueVKtg.png) ##### 成品 {%youtubeiHSLpk1gi0g %} ## 第三次作業 ### 第九堂課 #### 數值滑桿練習 - 滑桿間隔顯示(圖一)及(圖二) ![](https://i.imgur.com/mJM1Zgk.png) ![](https://i.imgur.com/hY0rQDc.png) - 作一圓(x)^2+ (y-6)^2 = r^2 , ( 0<r<4 ) {%youtubeFLroHgI5TK4 %} - 作一直線平行L而動 {%youtubek1zewof41Kk %} - 作一拋物線y=ax^2+bx+c(可顯示上下,左右平移)並用文字方框顯示函數 {%youtubemsyp-kgggK4 %} ### 第十堂課 #### sequence練習 ##### 操作說明 - step1 ![](https://i.imgur.com/eUdx5l3.png) >指令 ![](https://i.imgur.com/9QOeqiT.png) - step2 ![](https://i.imgur.com/YSir4DG.png) >指令 ![](https://i.imgur.com/kVugQMT.png) - step3 ![](https://i.imgur.com/pktglZV.png) >指令 ![](https://i.imgur.com/sUbRYor.png) - step4 {%youtube y2hG5zNZfrE %} >指令 ![](https://i.imgur.com/OKtkNLH.png) ### 第十一堂課 #### 移動的狗狗 {%youtube 8v6B2nrKr-8 %}

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