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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)