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(x2−x1)2+(y2−y1)2\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}(x2−x1)2+(y2−y1)2
m=y2−y1x2−x1m = \frac{y_2 - y_1}{x_2 - x_1}m=x2−x1y2−y1
M=(x1+x22,y1+y22)M = \left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right)M=(2x1+x2,2y1+y2)
y=mx+cy = mx + cy=mx+c
y=ky = ky=k (constant)
x=kx = kx=k (constant)
m=tanθm = \tan \thetam=tanθ for 0°≤θ<180°0° \leq \theta < 180°0°≤θ<180°
m1=m2m_1 = m_2m1=m2
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
Add 180° to reference angle
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