Nexus is a type of gear hub made by Shimano, who happily sell their hubs to several different bicycle manufacturers. Hence you can find Nexus hubs on bikes of different brands.
OK, what are are these various brands?
Look, there's no magic in designing a bike to take a Nexus hub, so there are plenty of brands who have used them. Tracking down each end every one of them is a chore that I'm not about to undertake. Not to mention all the happy home tinkerers who've converted whatever frame they fancied to Nexus. A short search throws up Trek, Cannondale, Bianchi, and two local UK brands that have used Nexus.
If you really want to know either do the web trawling yourself, or see if you can charm a Shimano rep enough to tell you which bike companies they sell to.
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Routing - transport logistics. This is done on a personal basis whenever you choose to "kill two birds with one stone": while I am down that way I may as well pick up xyz.Locating distribution hubs.
If this is a real-life question it can't be answered, as real rims and hubs have all kinds of shapes to them that mess up the measurements. IRL a spoke wouldn't reach all the way to the center for instance, it'd be attached some way off, at the hub flange. You'd also need to know what lace pattern is being used, as that affects spoke length. But if this was a maths question that isn't required to make sense then spoke length would be (42/pi)/2.