|≈||approximately equal to|
|digits||indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …)|
circular inch is a unit of area. it uses in Imperial/US system. it exactly equal π⁄4 sq in and approximately ≈ 5.067075 × 10−4 m2
Square kilometre (International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre, the SI unit of area or surface area.