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As well, lumber is still measured in Costa Rica using a system based on 4 vara, or 11 feet, for both round and square wood. With square wood, using inches, the width is multiplied by the depth to get a measurement called pulgadas, or inches. The lumber is charged 'per inch', which is a measurement of 2.2 litres (11 ⁄ 12 board foot).
where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.