An acute triangle is a triangle with all three angles acute (less than 90°).

An obtuse triangle is one with one obtuse angle (greater than 90°) and two acute angles.

Since a triangle angles must sum to 180°, no triangle can have more than one obtuse angle.

Acute and obtuse triangles are the two different types of oblique triangles

i.e. triangles that are not right triangles because they have no 90° angle.

So, in a triangle, angles above 90° are possible.