Angle PQR is formed by segments PQ and QR on the following coordinate grid:
A coordinate grid is shown from positive 6 to negative 6 on the x-axis and from positive 6 to negative 6 on the y-axis. A line segment PQ is shown with P as ordered pair negative 1, negative 1 and Q as ordered pair negative 5, negative 4. Another line segment QR is shown with R as ordered pair negative 1, negative 4.
Angle PQR is rotated 90 degrees counterclockwise about the origin to form angle P′Q′R′. Which statement shows the measure of angle P′Q′R′?
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