the diameter of a circle is always equal to 2 times its radius.
arc:弧chord:弦center:圆心radius:半径diameter:直径secant line
determining the diameter of a circle by a pair of arms and a
把73亿人塞到一栋楼里面,会发生什么?
8th june 2018. barley. c.90 feet (27.5m) diameter.
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