三角形面积演示 by Mark Dabbs

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Midpoint(b) → D
3. Rotate(A, Rotate, D) → A'
4. Rotate(B, Rotate, D) → B'
5. Rotate(C, Rotate, D) → C'
6. Polygon(A', B', C') → poly1', c', a', b'
7. Segment(A, C) → e
8. Segment(C, B) → f
9. Segment(B, A) → g
10. Segment(C', B') → h
11. Segment(B', A') → i
12. Segment(A', C') → j
13. Angle(C, B, A) → α