Answer: 24.5 units.
Step-by-step explanation:
The formula to find the circumference of circle is given by :-
[tex]C=2\pi r[/tex], where r is the radius of the circle.
Given : A circle has a circumference of 153.86 units.
Therefore, the circumference of circle will be :-
[tex]153.86=2\pi r\\\\\Rightarrow\ r=\dfrac{153.86}{2\pi}\\\\\Rightarrow\ r=\dfrac{153.86}{2(3.14)}=24.5\text{ units}[/tex]
Hence, the radius of the circle is 24.5 units.
