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If the circumference is split into 4 arcs then the 4th arc is 360-20-140-50 = 150 degrees
If it is 50 * 140 feet then you cannot since the first is a measure of length.If, instead, it was 50 feet * 140 feet then the answer is 50*140 = 7000 square feet.
Suppose the angle is x. Then its complement is 90-x x - 50 = 90 - x or 2x = 140 so that x =70.
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