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The test statistic is a measure of how close the sample proportion is to the null value.
Suppose the number is n/d. Then n/d >= d => n <= d2 if d < 0 or n >= d2 if d > 0.
Suppose the angle of the arc is x radians and the length of the arc is a units. Then, if the radius of the circle is r units, a = rx or r = a/x So d = 2a/x units of length.
In a parallelogram adjacent angles are supplementary, so angles are 75 degrees (A & C) and 105 degrees (B & D).