Warm Up (Part 2)

Here, points B and C have been locked. The original Lisa is locked too. See the question prompt below this app.
Use the slider to slowly start rotating Lisa's picture about the origin. Find all angle measures (after ) that cause B' and C' (coordinates of the rotated Lisa) to also be integers (positive or negative whole numbers). What is these angle measures? List them below:
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– Tim Brzezinski

Information: Warm Up (Part 2)