Explanation for Question 18 From the Math (No Calc) Section on the Official Sat Practice Test 7
Question 18 says the number of radiants in a 720 degree angle 2 can be, can be written as a pie where a is a constant, 3 what is the value of X? So to solve this problem, 4 we're going to need to convert the degrees to radiance. 5 And we're going to use that doing this equation, which I've written out already. 6 You can multiply the degree about times PI over 180, 7 and that will convert it into radians. 8 So 720 times PI over 180, 9 it's just a cool to four PI, 10 which is the number of radians. 11 And to the question is asking what a PI in a PI with a 12 equal to, so you can just divide both sides by PI to get four 13 is equal to a, and the correct answer is four.