# Figure 3 - The Riemann Sphere in GeoGebra

- Topic:
- Sphere

Given a complex number z_1=1+i, the PRiemannz tool plots the spherical point RS(z1)
whose image by the stereographic projection, in consideration, is exactly z_1. The point in the
sphere is given, as expected, by Intersect[Segment[(0, 0, 1), z_1], Sphere[(0, 0, 1), 1], 2].