1 ri is equal to the product of 36 cho multiplied by 360 (shaku per cho) and then 12960 shaku, because 1 cho is equal to the product of 60 ken (a unit of length) multiplied by 6 (shaku per ken) and then 360 shaku. |
1町=60間×6(尺/間)=360尺であるので1里=36町×360(尺/町)=12960尺となる。 |