金字塔展开与几何性质演示：立体几何作图范例

GeoGebra 命令及参数

1. Point(yAxis) → A
2. Point(xAxis) → B
3. Point(yAxis) → C
4. Point(xAxis) → D
5. Polygon(A, B, C, D) → poly1, a, b, c, d
6. Point(zAxis) → E
7. Pyramid(poly1, E) → e, faceABE, faceBCE, faceCDE, faceADE, edgeAE, edgeBE, edgeCE, edgeDE
8. Circle(edgeAE, B) → f
9. Point(f) → F
10. Polygon(E, A, F) → poly2, f_1, e_1, a_1
11. Center(f) → G
12. Segment(F, G) → g
13. Segment(G, B) → h
14. Angle(B, G, F) → α