<a href='https://edu.yz.yamagata-u.ac.jp/developer/Asp/Youzan/Physics/Quantity/@Quantity.asp?nQuantityID=195'>動径</a><a href='https://edu.yz.yamagata-u.ac.jp/developer/Asp/Youzan/Physics/Quantity/@Quantity.asp?nQuantityID=195'> <var>r</var></a>〔<a href='https://edu.yz.yamagata-u.ac.jp/developer/Asp/Youzan/Physics/Unit/@Unit.asp?nUnitID=2'>m</a>〕