Do triangles have at least 2 acute angles?
Yes.
The sum of the angles in a triangle is 180°
All angles in a triangle must be greater than 0° which means
that the sum of any two angles must be less than 180°
If two angles are right angles (90°), their sum is 180° which is
not less than 180°; thus at most one angle can be a right
angle.
If one angle is a right angle and another is an obtuse angle
(greater than 90°), then their sum is greater than 180°, which is
not less than 180°; thus there can be at most one of a right angle
and an obtuse angle.
If two angles are obtuse angles, their sum is greater than 180°,
which is not less than 180°; thus there can be at most one obtuse
angle.
If there is at most one right angle or an obtuse angle, there
must be at least two acute angles.