Question

why there is measurement on two sides of protactor​

Answer 1

The two scales make it easy for us to measure angles facing different ways. To measure the size of angle ABC, place the protractor over the angle so that the centre of the protractor is directly over the angle's vertex, B; and the base line of the protractor is along the arm, BA, of the angle.

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Answer 2

as some angles are formed on right and some left so we can't completely rotate it. that's why