If we use the inner measures of the protactor then what is the use of the outer part?

Since we measure angles in clockwise manner you are supposed to use the inner measures. You an use the outer readings as well but then you'll have to make sure you know where exactly you want your zero to be. What this means is that the base arm from which the angle starts must coincide with zero.

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 OUTER PART IS USE TO MEASURE THE OBTUSE ANGLE (MORE THAN 90,LESS THAN 180).. 

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