Q.How Much Of A Radius Does The Citronella Plants Scent Put Off Out
I just need to know how big of a radius the citronella plant puts out to keep mosquitos away

Certified GKH Gardening Expert
It doesn't, really, unless you put it directly on your skin. What you do rub the crushed leaves on will have a barrier to prevent them from landing on or near the spot. It isn't clear how far this range is.
I would crush some of the leaves, and soak them in water, and use that to spray the area, and yourselves. This would be most effective.
https://www.gardeningknowhow.com/plant-problems/pests/insects/mosquito-repelling-plants.htm