You measure angles from either side of the protractor. One set of numbers measures from the left side, the other measures from the right side.
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What are equal sets?? A set is a grouping of numbers. Set P = {1,4,9} if set Q is equal it must contain exactly the same numbers.
A protractor measures the degree of angles and circles.
A protractor is normally used to construct angles.
To make it convenient to measure angles in either direction.