# Principia Prop. I.7 cor. 2

- Author:
- Alexis Doval

Figure for Newton Principia Prop. I.7 cor. 2

The force acting on P revolving around S is to the force on R revolving around S as the square RP×SP is to SG³, that is,

- Author:
- Alexis Doval

Figure for Newton Principia Prop. I.7 cor. 2

The force acting on P revolving around S is to the force on R revolving around S as the square RP×SP is to SG³, that is,