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Each interior angle is 140 degrees. Each exterior angle is 220 degrees.
supplement + angle = 180180 - angle = supplementangle = supplement + 40 = 180 - angle +40 = 220-angle2 x angle = 220angle = 110 degrees
To be precise, as the little hand will also have moved, the answer would not be 240° for the large angle and 120° for the small angle, as some might say. The little hand will have moved 20°, so the answer would be that the large angle would be 220° and the small angle would be 140°.
You'll also need a protractor to construct a 220 degree angle which can then be bisected by means of a compass and a straight line to form two 110 degree angles.
LCM of 110 and 220 is 220.