<p>Does any one have a list of all the formulas you need to know for the ACT? I am looking for the ones you have to know for some specific questions, like the equation of the circle (which is very simple if you know the formula and basically impossible if you don't)?</p>
<p>bump…</p>
<p>three important things
SOH CAH TOA
area of circle = pie radius squared
circumfrence = 2radius pie
area of triangle = 1/2 height times the base
and the squares, rectangle ones i presume u know
good luck
the rest they should give you</p>