Just the one.
If its a triangle then just the one but if it is a square or a rectangle then 4 of them.
one
Just the one and the other two angles must then be acute angles
There is no such shape since an angle can always be added to any shape.
3
2:.
One dummies.....
Just the one.
None
Two. Two acute angles in a right triangle.
Only one of them
If its a triangle then just the one but if it is a square or a rectangle then 4 of them.
A triangle can have up to all three acute angles. An equilateral triangle has three- sixty degree angles, which are acute.
Two of them and they must add up to 90 degrees
A right triangle cannot contain any obtuse angles. The right angle represents 90° and the total of all three angles must be 180°. There is only 90° left for the remaining two angles, so neither can be obtuse (greater than 90°).
one