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11 cards from this deck
Right angle (909090°)
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
m2=−1m1m_2 = -\frac{1}{m_1}m2=−m11
Vertical line x=kx = kx=k
Undefined
000
y−y1=m(x−x1)y - y_1 = m(x - x_1)y−y1=m(x−x1)
Find negative reciprocal of given slope
Check if m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
−12-\frac{1}{2}−21
13\frac{1}{3}31
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