Choose all true statements from those given below. refer to the diagram.

if the ratio of the arc length to ris equal to 1, then the measure of is 1 radian.

if the ratio of the arc length to ris equal to 1, then the measure of is always
equal to r radians.

if the measure of is 1 radian, then the arc length is r.

if the ratio of the arc length to ris equal to 1, then the measure of is 60°