Answer:
18 sq.m
Explanation:
Area of the part with cement = area of backyard - area of grass part
Backyard:
length = l = 6m ; Width = w = 4 m
Area of backyard = l * w = 6*4 = 24 sq. m
Grass part:
l = 3 m ; w = 2 m
Area of the grass part = 3*2 = 6 sq.m
Area of the part with cement = 24 - 6 = 18 sq.m