Unless you are ready for some complicated trigonometry, I would suggest that you use a protractor and draw a 50 degree angle BEYOND a right angle.
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40 degrees ( 180 - 140 = 40 )
Use a protractor to draw a 55 degree angle and indicate that the angle needs to be measured once around the circle and then some.
draw the outside angle if you want to show 270 degrees then you draw a 90 degree angle but draw the circle outside of it
An Obtuse angle is any angle in which its degree is greater than 90 and less than 180.
Construct 2 perpendicular lines which will meet at 90 degrees then by bisecting this angle wll give a 45 degree angle