the floor of a rectangular room is 21 m long and 12 m wide . the room is surrounded by a veranda of width 2 m on all its sides . the area of the veranda is :
"area of the outer rectangle = 25 ã — 16 = 400 m 2 area of the inner rectangle = 21 ã — 12 = 252 m 2 required area = ( 400 â € “ 252 ) = 148 m 2 answer d"
subtract(rectangle_area(add(multiply(2, 2), 21), add(12, multiply(2, 2))), rectangle_area(21, 12))