Memorize Important Math Equations for the SAT
At the beginning of each SAT Math section you are provided with "reference information" which is a listing of equations and a few facts that might be useful in solving some of the problems. However, even though the SAT provides you with these equations, you should memorize and know how to use them before the test. Knowing the equations ahead of time will save you valuable minutes on test day.
The following is what will be given to you at the beginning of each SAT Math section.
Area of a Circle
A = πr2 where A = area; r = radius
Circumference of a Circle
C = 2πr where C = circumference; r = radius
Area of a Rectangle
A = lw where l = length; w = width
Area of a Triangle
A = bh/2 where b = base; h = height
Volume of a Box
V = lwh where V = volume; l = length; w = width; h = height
Volume of a Cylinder
V = πr2h where r = radius; h = height
Pythagorean Theorem
c2 = a2 + b2
Special Right Triangles
30-60-90 and 45-45-90 (You will need to know the proportions of these special triangles. Most likely you will be tested on these.)
A cicle is 360 degrees; a straight angle is 180 degrees; and a triangle is 180 degrees.
Memorize the preceding equations and know how to use and apply all of them.