The minimum number is zero(0).
The maximum number is one (1).
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0.
A triangle can either have no right angles or it can have 1 (in which case it is a right angle triangle).
There are no obtuse angles in a right triangle. A right triangle consists of one right angle and two acute angles.
All three interior angles of a spherical triangle may be right angles.
Depends on the type of triangle. A right-angled triangle has ONE right angle - the remaining two angles total 90 degrees.
one
Just the one