Question

In what quadrant would the triangle be if rotated 90 degrees

Answer 1

I strongly believe the answer is 2, if it isnt that it must be 3.

Answer 2

"Rotated around the origin", as the question actually says, puts it in Quadrant-II (2).

But the way you put the question, just saying the triangle is rotated 90°, leaves it right where it is, in Quadrant-I, with vertex-H on the bottom.