两平面夹角 by chunyeeleung

GeoGebra 命令及参数

1. Intersect(xAxis, zAxis) → A
2. Polygon(A, B, C) → t1, c, a, b
3. Pyramid(t1, e) → f, E, faceABE, faceBCE, faceACE, edgeAE, edgeBE, edgeCE
4. Angle(E, A, C) → α
5. Angle(B, A, E) → β
6. Angle(B, A, C) → γ
7. Point(edgeAE) → D
8. OrthogonalLine(C, edgeAE, space) → h
9. Line(D, h) → g
10. Intersect(g, b) → F
11. Intersect(g, h) → G
12. OrthogonalLine(B, edgeAE, space) → i
13. Line(D, i) → j
14. Intersect(j, c) → H
15. Intersect(i, j) → I
16. Segment(D, F) → k
17. Segment(D, H) → l
18. Angle(H, D, F) → θ
19. Angle(edgeAE, k) → δ
20. Angle(l, edgeAE) → ε