A square hectometer (often abbreviated as hm²) is a unit of area in the International System of Units (SI). It represents a square with sides that each measure 100 meters (10,000 centimeters) in length.
One square hectometer is equal to 10,000 square meters (m²) because each side of the square is 100 meters long, and when you square that length, you get 10,000 square meters.
To put it in perspective, a square hectometer is equivalent to 0.01 square kilometers (km²) because 1 square kilometer is equal to 100 hectares.
Square hectometers are not as commonly used as some other units of area, but they can be helpful for measuring large land areas, especially in some scientific and land management contexts.
A square pole, also known as a square perch, is an obsolete unit of land area measurement that was historically used in some English-speaking countries, including the United States and the United Kingdom. It is part of the older system of land measurement.
One square pole is equivalent to one square perch. In terms of modern measurements, one square pole is approximately equal to 25.29285264 square meters (m²) or 0.00625 acres.
As with other outdated units of land area measurement, the square pole is no longer commonly used in modern land transactions or legal documents. More standardized systems of measurement, such as square meters and square feet, have largely replaced these units.