圆锥的展开图：斜高恒定

GeoGebra 命令及参数

1. Point(Circle[A, radius]) → B
2. Segment(A, B) → r
3. Circle(A, B) → c
4. Point(c) → C
5. Tangent(C, c) → f,
6. OrthogonalLine(C, f) → g
7. Point(Circle[C, slant]) → D
8. Segment(C, D) → h
9. Intersect(c, h, 1) → E
10. Circle(D, E) → d
11. Circumference(c) → circumferencec
12. PointIn(c) → Pointc
13. Rotate(D, ((360 * r / h))°, C) → D'
14. Rotate(E, ((360 * r / h))°, D) → E'
15. Angle(E, D, E') → α
16. CircleSector(D, E, E') → e
17. Distance(E, E') → distanceEE'
18. Length(e) → a
19. PointIn(e) → Pointe