If r is the
- if r is the set of real numbers
- if r is the maximum horizontal range
- if r is the radius of the base of the hat
- if r is the universal gas constant
- if r is the smallest equivalence relation
- if r is the work done on the system
- if r is the radius of the first orbit
- if r is the radius of the earth and g
- if r is the average radius of earth
- if r is the radius of the earth
