what is the square root of 3,969 ?
"a square root of a number is a number times itself equals the original number . ex ) the square root of 81 is 9 because 9 times itself ( 9 ) equals the original number ( 81 ) . 63 * 63 = 3,969 3969 divided by x = 63 x = 63 ( d ) 63"
circle_area(divide(3,969, multiply(const_2, const_pi)))