周三径一 zhōusānjìngyī three to one ratio Origin Definitions Defs Strokes Stroke Words Sentences Sents 周 zhōu nounlocative all around (bound form) circumference; periphery; circle; cycle三 sān numeral three the number three; 3径 徑 jìng noun diameter (bound form) the diameter of a circle; a straight line passing through the center of a circle一 yī numeral one one; the number 1; single; alone