Eurasia covers around 55,000,000 square kilometres (21,000,000 sq mi), or around 36.2% of the Earth's total land area. The landmass contains around 5.0 billion people, equating to approximately 70% of the human population. Humans first settled in Eurasia between 60,000 and 125,000 years ago.
The Imperial system recognizes a yard as a linear measurement unit for measuring length or distance. Yard is commonly used in modern US system of measurement. A yard is equal to 36 inches or 3 feet. Both units of yard and inch have been used since the 13th century.
Foot is an imperial, US customary length unit. 1 foot is 12 inches or 1/3 of a yard. The abbreviation is ft or (â²) prime symbol. Centimeter is a metric unit and equals to one hundredth of a meter which is base metric length unit.