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The minimum number is zero(0). The maximum number is one (1).
A triangle can have a maximum of 1 right angle!
There are no obtuse angles in a right triangle. A right triangle consists of one right angle and two acute angles.
The maximum number is 5.
A triangle can only have a maximum of 1 right angle. The total degrees of all the angles of a triangle adds up to exactly 180. Since a triangle must have exactly three angles, it is not possible for the triangle to have more than one angle that is 90 degrees.