1. it useful in geometry
2. used for drawing a straight line
It's used for drawing 30, 60 and 90 degree angles. There is also a version for 45 degree angles.
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The domain of a function is the set of numbers that can be valid inputs into the function. Expressed another way, it is the set of numbers along the x-axis that have a corresponding solution on the y axis.
The domain of a function is the set of values for which the function is defined.The range is the set of possible results which you can get for the function.
The set of output values of a function or relation is the range
The set of values for which the function is defined.
The domain of your function is the set of real numbers.