Given
Length of the hail = 18m
Breadth of the hail 12.5m
Width of the strip = 50cm = 1/2 m
Length of inner rectangle = 18 – (1/2 + 1/2) 17m
Breadth of inner rectangle = 12.5 – (1/2 + 1/2) = 11.5 m
Area of the strip = (Area of the outer fIgure) – (Area of the inner figure)
= 18 × 12.5 – 17 ×11.5
= 225 – 195.5 = 29.5 m2
∴ Area of the carpet = 195.5 m2