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10 cards from this deck
d=(x2−x1)2+(y2−y1)2d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}d=(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)
m1=m2m_1 = m_2m1=m2
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
−1m-\frac{1}{m}−m1
y=mx+cy = mx + cy=mx+c
mmm = gradient, ccc = y-intercept
ax+by+c=0ax + by + c = 0ax+by+c=0
m=tanθm = \tan \thetam=tanθ
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