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geometry formulas chapter 13

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distance formula
d = √( x₂ - x₁)² + (y₂ - y₁)²
equation of a circle with center (a,b) and radius r
(x-a)² + (y-b)² = r²
slope formula
m=y₂-y₁/x₂-x₁
midpoint formula
(x₁+x₂/2, y₁+y₂/2)
slope-intercept formula
y=mx+b
point-slope formula
y-y₁=m(x-x₁)