等腰梯形构造模板

GeoGebra 命令及参数

1. Line(A_{1}, B_{1}) → f
2. OrthogonalLine(B_{1}, f) → g
3. OrthogonalLine(A_{1}, f) → h
4. Point(f) → A_{2}
5. Point(f) → B_{2}
6. OrthogonalLine(B_{2}, f) → i
7. OrthogonalLine(A_{2}, f) → j
8. Point(i) → A
9. Point(j) → B
10. Mirror(A, f) → D
11. Mirror(B, f) → C
12. Polygon(D, A, B, C) → q1, a', a, b, b'
13. Segment(A, D) → k
14. Segment(B, C) → l