<p>In addition to the formulas that the SAT puts in front of each math section, which formulas would be a good idea to memorize?</p>
<p>Thanks</p>
<p>Is there even a reference sheet on the ACT?</p>
<p>No reference sheet, I just did a practice Math test in the Red Book.</p>
<p>They always ask the circle formula with center at (h,k).</p>
<p>(x-h)^2 + (y-k)^2 = r^2</p>
<p>They normally test you on:</p>
<p>1) Knowing that the X and Y coordinates are negatives in this equation (if center of a circle is (-2, -3) and the radius is 2, the formula would be (x+2)^ + (y+3)^2 = 4.</p>
<p>2) They’d also require that you need to know that the radius is squared in this formula.</p>
<p>Also, make sure you know the Law of Sines (don’t need to know Law of Cosines) and be ready to answer any probability questions including permutation/combination. Memorize the 30-60-90 and 45-45-90 triangles, too. Know what their side ratios are. Other than that, you shouldn’t need to know much. As long as you have the general gist of geometry / algebra / trigonometry, you’ll be fine.</p>