Look at the triangle below which of the following represents two of the angle measures of the triangle
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The range of a function is the set of the all values taken by the function, for all possible inputs.
When you watch this from a graphical point of view, the range is the portion of the y axis that the graph spans.
In this case, you can see that the lowest point reached by the function (its minimum) is . You can also see that the function is unbounded upwards.
So, the range is , and the lowest value is thus 2.