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dsProject/dsLightRag/Util/GGB/extracted/26c367a3c3cf20e62e1d6c7904f6abf6/GGB.txt
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根据题目要求和图形描述我将生成GeoGebra命令序列。注意以下关键点
1. 以A为原点(0,0)AB方向为x轴正方向
2. 设AB=10无明确长度时的默认值
3. O为AB中点
4. D在y轴上设AD=8合理假设值
5. 通过角度相等条件确定C点位置
GeoGebra命令序列
```geogebra
A = (0, 0)
B = (10, 0)
O = Midpoint(A, B)
D = (0, 8)
C = (x(B), y(D)) // C的x坐标与B相同y坐标与D相同
quad = Polygon(A, B, C, D)
segOD = Segment(O, D)
segOC = Segment(O, C)
```
**构建说明:**
1. 点A(0,0)为坐标原点
2. 点B(10,0)确定x轴方向及AB长度
3. O通过Midpoint命令确保为AB中点
4. D(0,8)在y轴上AD=8
5. C(10,8)由B的x坐标和D的y坐标确定满足
- ∠B=90°BC垂直AB
- ∠AOD=∠BOC因|OD|=|OC|
6. 四边形ABCD自动满足矩形特征
- ∠A=∠B=∠C=∠D=90°
- 对边平行且相等
此构建严格遵循题目条件,通过坐标约束实现角度相等条件,避免自由点和未定义元素。