an error 2.5 % in excess is made while measuring the side of a square . the percentage of error in the calculated area of the square is
"100 cm is read as 102 cm . a 1 = ( 100 x 100 ) cm 2 and a 2 ( 102.5 x 102.5 ) cm 2 . ( a 2 - a 1 ) = [ ( 102.5 ) 2 - ( 100 ) 2 ] = ( 102.5 + 100 ) x ( 102.5 - 100 ) = 506.25 cm 2 . percentage error = 5.0625 d"
divide(multiply(subtract(square_area(add(const_100, 2.5)), square_area(const_100)), const_100), square_area(const_100))