Square Perch
A square perch is a traditional unit of area, also known as a square rod or pole. It represents the area of a square with sides one perch (rod) long.
1 perch (rod) = 16.5 feet
1 square perch = 16.5 ft × 16.5 ft = 272.25 square feet ≈ 25.29 square meters
160 square perches = 1 acre
Square perches were commonly used in land surveying and property descriptions, especially in the UK and older US records.
Square Dekameter [dam²]
A square dekameter (dam²) is a unit of area representing a square with sides 1 dekameter (10 meters) long.
1 dam² = 100 m².
It’s used to measure medium-sized areas like small plots of land or large rooms.