You could estimate. If it is not right, it is between 90 degrees and 0 degrees. If it is between right and straight angles, it would be between 90 degrees and 180 degrees. You can sort of figure out roughly where each and measurement was.
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A protractor is used to measure angles.
With a protractor
With a protractor
A protractor is a geometric tool that is used to measure the degree of angles.
A protractor