How to make these triangles into quads

Question

I have these triangles I need to make into quads, I'm confused how to achieve this.

Answer 1

Not sure what you mean by "triangles", there's only one, the rest showing are quads (and two n-gons). That having been said, this is one of the standard ways to change a tri like that to a quad:

That won't be the best topology for all circumstances, but without anything else to go on? That's how I'd do it. If you wanted all-quads:

That makes two E-poles or 5-poles, indicated by the green arrows. Another potential all-quads solution would be:

Answer 2

Hope, I understand you right. If you want to make your topology look like this:

you can just merge vertices of triangles at center (m key -> at center) and you will get something like this: I suppose you should do it for every place where you have that pairs of vertices.