an error 4 % in excess is made while measuring the side of a square . what is the percentage of error in the calculated area of the square ?
"percentage error in calculated area = ( 4 + 4 + ( 4 ã — 4 ) / 100 ) % = 8.16 % answer : c"
divide(multiply(subtract(square_area(add(const_100, 4)), square_area(const_100)), const_100), square_area(const_100))