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10 cards from this deck
Lines that meet at a 90-degree angle
90 degrees (right angle)
L shape
−1-1−1
m×m′=−1m \times m' = -1m×m′=−1
Flip it and change the sign
−12-\frac{1}{2}−21
13\frac{1}{3}31
Lines meet at right angle, form L shape
Multiply slopes; if −1-1−1, lines are perpendicular
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