Kreis und Kugel
Radius
= r
Durchmesser
= 2 ⋅ r
Umfang
= 2 ⋅ π ⋅ r
Kreisfläche
= π ⋅ r
2
Kugeloberfläche
= 4 ⋅ π ⋅ r
2
Kugelvolumen
= 4/3 ⋅ π ⋅ r
3