Keep your protector such that the line of 180 degree should match with the line that you draw to measure the angel. It should be kept exactly on that line, even a slight displacement can affect your measurement. Then properly adjust the protactor with other line in the same way. Then measure the angel. The resultant distance between the angels is the answer. 
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  • Brainly User
U should measure from left of the protactor
u should have to mark the angle which u r asked to draw.The big line is 4 measuring the angles which r written and the small lines are measured as 1,2,3, after the big line taking the angles written just above the big lines.
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