A rood is an old and largely obsolete unit of land area measurement. It was historically used in some English-speaking countries, particularly in the United Kingdom and Ireland, but it is not commonly used today, and its use in official measurements has been largely phased out.
In the traditional system, one rood is equal to one-quarter of an acre. This means that there are 4 roods in one acre. Converting to modern units, one rood is approximately 1,011.71 square meters (m²) or 0.101171 hectares (ha).
The term "rood" is often associated with medieval land measurement systems and was used in land and property transactions in the past. While it may occasionally appear in historical documents or literature, it is no longer a standard unit of measurement for land area in most countries.
A square perch, often referred to as a "square pole" or simply "perch," is an obsolete unit of land area measurement. It was historically used in some English-speaking countries, including the United States and the United Kingdom, for land surveying and property descriptions.
One square perch is equivalent to one square rod or one square pole. In terms of modern measurements, one square perch is approximately equal to 25.29285264 square meters (m²) or 0.00625 acres.
Like other obsolete units of land area measurement, the square perch has largely been replaced by more standardized systems of measurement, such as square meters and square feet, in modern times. It is rarely encountered in contemporary land transactions or legal documents.