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Chapter 12
Numbers that turn
A number whose square is −1 is a quarter turn.
1
Half a turn, then a quarter
× (−1) swings the arrow half way round. Which number turns it only a quarter? Tap × i twice.
Chapter 12
A number whose square is −1 is a quarter turn.
× (−1) swings the arrow half way round. Which number turns it only a quarter? Tap × i twice.