以 r 开头的数学词汇 | 玄数

2012-10-08
radian   弧度
A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17′44.6″.
1radian

radical   根

  • A root of a number or quantity.
  • The set of elements of a ring, some power of which is contained in a given ideal.

radicand   被开方数
A number or quantity from which a root is to be extracted, under a radical sign: 3 is the radicand of √3.

radius   半径
A straight line extending from the center of a circle or sphere, or regular polygon to the circumference or surface.

radix   根;基数

  • The base of a system of numbers, such as 2 in the binary system and 10 in the decimal system.
  • The base of a system of logarithms.

random   随机
Statistics. of or characterizing a process of selection in which each item of a set has an equal probability of being chosen.

random Sample   随机抽样
A sample in which every element in the population has an equal chance of being selected.

range   范围;排列

range of a function   函数的值域


ratio   比率

rational expression   有理式

rational function   有理方程

rational number   有理数

ray   射线

real number   实数

reciprocal   倒数

rectangle   矩形

rectangular coordinate system   平面直角坐标系
rectangular coordinate system

rectangular prism   直角棱镜

recurring decimal   循环小数

recursive   递归

reduce   缩减

reflection   反射

reflection symmetry   反射对称

reflex angle   优角

regular polygon   正多边形

regular polyhedron   正多面体

relatively prime   互素,互质

remainder   余数

repeating decimal   循环小数

revolution   公转

rhombus   菱形

right angle   直角

right-angled triangle   直角三角形

rigid   静止

rise   上升

Roman Numerals   罗马数字

root   根

rotation   回转

rotational symmetry   旋转对称

rounding   四舍五入

row   行

ruler   尺子   run   路程