what is the square root of 6,561 ?
"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 ) . 81 * 81 = 6,561 6561 divided by x = 81 x = 81 ( e ) 81"
circle_area(divide(6,561, multiply(const_2, const_pi)))