SAT Math Formulas

Not a comprehensive list; just the ones I commonly forget

Quadratic vertex formula

Length of an arc

Given theta in radians

Vertex in standard form

Sum of solutions quadratic

Product of solutions quadratic

Vertex in factored form

(x - r1)(x - r2)

Inscribed angle theorem

Interior angles of regular polygon

Slope of a line in standard form

Y-intercept of line in standard form

Right triangle complementary angles

Axis of symmetry of a parabola

Or the midpoint between two x-values that have the same y-value

Similar solids ratios

K is the scale factor

Isosceles right triangle ratios

Radius of a circle is perpendicular to…

…the tangent line at the point of tangency

Equilateral triangle area

Equilateral triangle height

Consecutive interior angles theorem

Cofunction identities

sin(90 - x) = cos(x)

cos(90 - x) = sin(x)

tan(90 - x) = cot(x)

cot(90 - x) = tan(x)

sec(90 - x) = csc(x)

csc(90 - x) = sec(x)

In a right triangle where angles a+b=90°, then…

sin(a) = cos(b) (only true for right triangles).