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Slope formula
y2-y1/x2-x1
MDPT formula
(x1+x2/2, y1+y2/2)
Distance formula
√( x₂ - x₁)² + (y₂ - y₁)²
Point slope formula
y - y1 = m(x - x1)
conditional
p --> q
converse
q --> p
inverse
if not p --> then not q
contrapositive
if not q --> then not p
biconditional
p if and only if q