an error 10 % in excess is made while measuring the side of a square . now what is the percentage of error in the calculated area of the square ?
"percentage error in calculated area = ( 10 + 10 + ( 10 ã — 10 ) / 100 ) % = 21 % answer : d"
divide(multiply(subtract(square_area(add(const_100, 10)), square_area(const_100)), const_100), square_area(const_100))