Distance Formula, d=√(x₂ - x₁)² + (y₂ - y₁)²

Midpoint Formula, m=(x₁+x₂/2), (y₁+y₂/2)

Trig Ratios, SOHCAHTOA

Geometric Mean, √a*b

Pythagorean Theorem, a²+b²=c²

Arc/angle rules, center=same, on circle=half, outside=saverage, inside=average

Point slope form and slope formula, y-y=m(x-x), y=mx+b

Law of sines ratio, sin∠a/a=sin∠/b=sin∠c/c