The length of the rectangle is 30 m
The width of the rectangle is 20 m
The sidewalk is 3m wide on all sides, so
length of sidewalk = 30+6 =36 m
Width of sidewalk = 20+6 = 26 m
Area of rectangle = [tex]length*width[/tex]
Area of rectangle = [tex]30\times20=600[/tex]
Area of rectangle including sidewalk = [tex]36\times26=936[/tex]
Hence, area of sidewalk alone = area of rectangle with sidewalk - area of rectangle
Surface Area = [tex]936-600=336[/tex] m²
