The measure of a flat space or surface
Area conversion rates
1 Square Yard = 0.83612736 Square Meters, derived from 1 Yard = 0.9144 Meters as per the International yard and pound agreement of 1959.
1 Acre = 1/640 Square Miles
1 Hectare = 10,000 Square Meters
1 Square Mile ≈ 2.58998811 Square Kilometers
The area of quadrilaterals equals the multiplication of the length and the height. Furthermore, all polygons can be broken down into triangles. Therefore, 1/2 * length * height formulates the area of a triangle, and so all polygons. Also, the well-known formula πr2 calculates the area of a circle.
When calculating surface areas, the object can be theoretically cut and flattened out. This creates a 2-D shape from which the final value can be derived.
The acre is a non-metric unit that is equal to 43,560 square feet or 1/640 square miles. The unit forms part of both the imperial and US customary system. Supposedly, the measurement originates from amount of land that a yoke of oxen could plough in one day.
The hectare, however, is a metric unit that is equal to 10,000 square meters or 100 ares, which is largely defunct. Therefore, it is itself a hundredth of a square kilometer. In contrast to the are, the hectare is the most common land measure around the world.