It's infinitely small. It can't be defined. Any angle can be divided ad infinitum. The best we can say is that it's close to zero.
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It is 1 degree after a right angle. A right angle is 90 degrees so the smallest obtuse angle is 91 degrees.
60 degrees, for an equilateral triangle, is the smallest interior angle.
40
The smallest angle of the triangle is opposite to its smallest side which is 4.6cm and so by using the sine rule: A/a = B/b = C/b the smallest angle works out as 38.43 degrees rounded to two decimal places.
It can have any value x degrees where 0 < x < 45.