what is 985 * 985 ?
"if you take a base of 1000 then 985 is 15 less than 1000 to get the product of 985 x 985 write like this 985 - 15 ( as 15 less than base 1000 ) 985 - 15 now 15 x 15 = 225 and 985 - 15 = 970 so 985 x 985 = 970225 . . . ( bingo the answer is e . you can even have a shortcut . . . . . . 15 x 15 = 225 . . . only answer choice has last three digits as 225 . . so no need to calculate 985 - 15 . after you get 15 x 15 you can straight way pick answer choice e ."
circle_area(divide(985, multiply(const_2, const_pi)))