圆周率 (yuán zhōu lǜ) — pi (the mathematical constant, approximately 3.14159)

Definition

Examples

• 圆周率是一个无限不循环小数。
  yuán zhōu lǜ Shì yí gè wú xiàn bù xún huán xiǎo shù.
  Pi is an infinite non-repeating decimal.
• 他背出了圆周率小数点后一百位。
  Tā bèi chū le yuán zhōu lǜ xiǎo shù diǎn hòu yì bǎi wèi.
  He recited one hundred digits of pi after the decimal point.
• 计算圆的面积需要用到圆周率。
  Jì suàn yuán de miàn jī xū yào yòng dào yuán zhōu lǜ.
  Calculating the area of a circle requires using pi.