A quadrantal angle is one whose initial arm is the positive x-axis and whose terminal arm is on the y-axis or the y-axis.
In other words, it is k(90 degrees), k is an integer.
(in radians: k(pi)/2)
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Yes. Quadrantal angles have reference angles of either 0 degrees (e.g. 0 degrees and 180 degrees) or 90 degrees (e.g. 90 degrees and 270 degrees).
they both measure the angle in degrees
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each measure of the angle at point h has a measure of
the answer is twice. the angle of rotation is twice the measure