chumbalumber
You don't have to, but it seems perfectly easy since you don't have to write anything down to solve it. c*sin(arctan(b/a)) gives b, and c*cos(arctan(b/a)) gives a. I'm not disputing that you can do it without, but I don't think it's necessarily any quicker or easier.
Ratios can be used in trig -- if it's 1.5 times as long as it is tall, tan(\theta) = \frac{2}{3}, which then allows you to find the lengths of the other two sides easily so long as you have a calculator.
I regret to inform you that it is in fact a Reddit copypasta, and not original content.
*Got it; more semicolon memes for you!
Beep boop
Well for starters you're missing Cornish off your list.
In support of your point, and to help clarify it, there's a lot of train lines where the cost (and the carbon output) of electrification is far beyond the benefit. A lot of the North Wales coast, for example, because working in the tunnels would be prohibitively expensive. In these cases it makes sense to have bi/trimodal trains, at least until electrification technology makes significant breakthroughs.
Another example might be cases where an old rail line (e.g. ex-mining) is looking at being reopened at a low capacity. It would be madness to immediately electrify. An example I have looked at was running a train for tourists on what is currently a little-used freight line (that still uses tokens!) in the Lake District.
We'd cruise the seas
Depends on the mushroom; certain mushrooms (e.g. beefsteak polypore) are incredibly distinctive, while others require microscopy to tell apart.
One thing you didn't mention that I think is a major drawback with id apps is smell. If you're looking at agaricus for edibility, yellow stainers are distinguished by smell if it's cold and the staining is less obvious.
Other things they can't use for id are texture (slimy cap Vs waxy etc.), staining (so you know what to look for -- boletes it's necessary to check for blue staining), brittle gills/stem (does it snap?)... All sorts!