וַיַּ֥עַשׂ אֶת־הַיָּ֖ם מוּצָ֑ק עֶ֣שֶׂר בָּ֠אַמָּה מִשְּׂפָת֨וֹ עַד־שְׂפָת֜וֹ עָגֹ֣ל ׀ סָבִ֗יב וְחָמֵ֤שׁ בָּֽאַמָּה֙ קוֹמָת֔וֹ וקוה [וְקָו֙] שְׁלֹשִׁ֣ים בָּֽאַמָּ֔ה יָסֹ֥ב אֹת֖וֹ סָבִֽיב׃
또 바다를 부어 만들었으니 그 직경이 십 규빗이요 그 모양이 둥글며 그 고는 다섯 규빗이요 주위는 삼십 규빗 줄을 두를만하며
Mishnah Eruvin
If [the cross-beam] was made of straw or reeds, we look at it as if it was of metal. [If it was] curved we look at it as if it were straight. [If it was] round we look at it as if it were square. Whatever has a circumference of three handbreadths has a diameter of one handbreadth.