Your explanation doesn’t make any sense at all, so I assume it is a joke ??
When you talk about rain intensity measurement in “centimeters”, you know that the cm (or mm, usually) just refer to the height of water that falled onto the ground… not the actual size of the rain drops.
Imagine a rain drop of 5cm, you could drown in that ! Or at least lost an eye…
And finally… just for the sake of it : radius can be measured in cm 😉
Open this URL, interesting investigation of rain vs radio propagation :