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Series 6: Turn turn
A 90˚ rotation about P (5, 1) followed by a 90˚ rotation about Q (3, 1) is equivalent to a 180˚ rotation about (4, 2).
P and Q are then moved, but the result remains the same. Find the new positions of P and Q.
The movie provides an intriguing view of the rotations: they are shown simultaneously. Does this view make sense?!
Turn turn (A)

The centres move to (4, 1) and (3, 2).

Turn turn (B)

The centres move to (3, 1) and (3, 3).

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Turn turn (C)

The centres move to (4, 1) and (3, 2), as in (A), but we take a different view.

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