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11 cards from this deck
Angle between two intersecting lines
tanθ=∣m2−m11+m1m2∣\tan \theta = \left| \frac{m_2 - m_1}{1 + m_1m_2} \right|tanθ=1+m1m2m2−m1
m1m2=−1m_1m_2 = -1m1m2=−1
90∘90^\circ90∘
m1=m2m_1 = m_2m1=m2
0∘0^\circ0∘
1+m1m2≠01 + m_1m_2 \neq 01+m1m2=0
tanθ=∣m2∣\tan \theta = |m_2|tanθ=∣m2∣
Identify the slopes of the lines
Use inverse tangent
∞\infty∞ (infinity)
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