18. Perimeter of rectangle = 2(l + b)
l = 16m
b = 12m
Perimeter of rectangular park = 2 (12 + 16)
= 24 + 32
= 56m
Perimeter of square park = 56m
(given that, perimeter of rectangular and square park are equal)
Perimeter of square = 4a
4a = 56
a = 56/4
a = 14m
Area of square park = a²
= 14²
= 196m²