At the beginning of each SAT Math Section is a formula box with many of the basic formulas. However, there are many other formulas that a student must also know, which are not given. Here is one important geometry formula:

To find the sum of the interior angles of any polygon use: (s-2) X 180 where s represents the number of sides. Using this formula to find the sum of the interior angles of 5 sided figure (a pentagon) (5-2) X 180=540 degrees. Assuming all the angles are equal, to find the value of each individual angle use (s-2) X 180/s, so (5-2) X 180/5=108.