If r
- if r be a vector perpendicular to a+b+c
- if r is the average radius of earth
- if r is a constant such that the equation
- if r is a constant such that
- if r is the radius of the earth and g
- if r squared is close to 1
- if r varies directly as s
- if r vectoru003dxi+yj+zk
- if r and h are the horizontal range
- if r is the radius of the earth
