Inverse square law.

I’m in first year of an network engineering degree and I’m not great at maths but I’m getting on okay so far.

I’m trying to learn inverse square law and maybe I’m just overthinking and making it difficult for myself or maybe I’m just dense.

I’ve got the formula for signal strength as d/n squared.

So if d was 1km and I need 6km it would be 1/36 squared but I sort of loose my thread of working when trying to work out things such as was 2km away and now 13km. Does d now = 2 or should it still be 1?

I’ve watched some YouTube videos but they just sort of went over my head

Edit - Sorry I’m not great at explaining.

This is how it’s explained in the text

“In general, the power collected by the antenna at a distance of d units will be (1/d)² times that received at a distance of one unit. So, for example, by putting d = 3 that the received power is (1/3)² or 1/9, of that collected at d = 1.

We express this by saying: received power is proportional to 1/d squared.”