As long as the angle measure is greater than 0 degrees, the angle can be infinitely small. There is no real "smallest possible angle", as any number has a number that is smaller than it while still larger than 0.
ANS2:The smallest whole number angle would be 1 degree. The opposite angle would be 89 degrees.You could, of course have smaller numbers--less than 1 degree as noted in the first answer. so long as the two opposites add to 90. All of the interior angles of any triangle add to 180 degrees.
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A triangle with 1 right angle is a right angle triangle.
a right triangle has one right angleA triangle with a right angle is a right triangle.
No
A 90o angle is a right angle, and a triangle with a right angle is called a right triangle.
If one angle is a right angle, it is a right triangle. If one angle is an obtuse angle, it is an obtuse triangle. If there are no right nor obtuse angle then it is an acute triangle.