Question

I am having trouble in trig/ geometry. It involves radicals, 30-60-90 triangles, and 45-45-90 triangles or something like that, I had poor notes, If you could give me a guide thats visual would be the most helpful. My math teacher showed me part of what I was looking for. It was a 30-60-90 or the other one I mentioned and he drew a triangle and then wrote multiply radical 3 to get this side.... I hope that made sense :P sorry if it didn't :/