semi circle edge has two scales worked from 0 to 180 degree inner scale which is read from right to left and outer scale which is read from left to right.
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You'll notice two sets of degrees along the edge: an inner and outer scale. Both scales go from 0 to 180, but they run in opposite directions. If the angle opens to the right side of the protractor, use the inner scale. If the angle opens to the left of the protractor, use the outer scale.
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