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The way the temperature scales work, lower numbers indicate colder temperatures.
A 21 degree angle is acute because it is greater than 0 but less than 90 degrees
-- If the fractional part of the angle is less than 1/2 degree, just throw away the fraction and forget about it. -- If the fractional part of the angle is 1/2 degree or more, add one to the degrees and throw away the fraction.
degree 1
2-2