Problem

Compare \(A~=~-\pi~/2\) and \(B~=~270°\). Convert \(A\) to degrees, compute \(A~-~B\), decide separately whether the measures are equal and whether their terminal sides are coterminal, then classify the pair.

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A is -90 degrees, so A - B = -360 degrees. The measures are not equal, their terminal sides are coterminal, and the pair is coterminal but not equal.

A is -90 degrees, so A - B = -360 degrees. The measures are equal, their terminal sides are coterminal, and the pair has equal measures.

A is 270 degrees, so A - B = 0 degrees. The measures are equal and the pair has equal measures.

A is -90 degrees, so A - B = -360 degrees. The measures are not equal and the terminal sides are not coterminal.

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