Answer:
The missing dimension, radius = 6.00 m
Step-by-step explanation:
We are given the following things:
Height of cylinder,
= 15 m
Radius of cylinder,
m (Labelled as
)
Volume of cylinder, 
Please refer to the image attached for the dimensions of cylinder as given.
We know that the volume of a cylinder can be given as:

Where
is the radius of cylinder
is the height of cylinder
Putting the values of
:

Hence, The missing dimension, radius = 6.00 m