The radian measure of central angle is 0.8 radians
Solution:
Given that we have to find the radian measure of central angle
From given figure in question,
Arc length = 60 units
Radius = 75 units

The radian measure of a central angle θ of a circle is given as:

Where,
"r" is the radius of circle
"s" is the length of arc
= central angle in radians
Substituting the known values,

Thus radian measure of central angle is 0.8 radians