Formulas - Formula Sheet Pythagorean Theorem a^2 b^2=c^2 Distance Formula d=sqrt(x2-x1)^2(y2-y1)^2 Equation of a Circle in Standard Form

# Formulas - Formula Sheet Pythagorean Theorem a^2 b^2=c^2...

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Formula Sheet Pythagorean Theorem a^2+b^2=c^2 Distance Formula d=sqrt(x2-x1)^2+(y2-y1)^2 Equation of a Circle in Standard Form Center: (h,k)Radius: r (x-h)^2+(y-k)^2=r^2 The Midpoint Formula (x1+x2)/2, (y1+y2)/2 Point Slope Formula y-y1=m(x-x1) m=slope; point(x1,y1) Slope Intercept Formula y=mx+b Relationship between parallel and perpendicular lines Parallel lines have equal slopePerpendicular lines have opposite reciprocal slope (flip) Quadratic Formula ax^2+bx+c [-b+/-sqrt(b^2)-4(a)(c)]/2a The Discriminant b^2-4ac