四面体的反射平面

GeoGebra 命令及参数

1. Point(Circle[Midpoint[A, B], (Distance[A, B] * sqrt(3) / 2), Segment[A, B]]) → C
2. Tetrahedron(A, B, C) → a, D, edgeCD, edgeBD, faceABC, faceACD, faceABD, faceBCD, edgeAC, edgeAB, edgeBC, edgeAD
3. Point(edgeCD) → F
4. Point(edgeAD) → G
5. Point(edgeAB) → E
6. Plane(G, F, E) → b
7. Intersect(edgeBC, b) → H
8. Polygon(G, E, H, F) → poly1, g, e, h, f