radius of a circle

R So if C is the circle, R is the disk of radius A.

就是C所包围的区域。，Well，，R，is，the，region，enclosed，by，C。，如果C是一个圆，R就是半径为a的圆盘。

The unit of plane angle adopted under the System International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius ( approximately 57.295 degrees).

国际单位制采用的平面角单位；长度等于半径的弧所对的圆心角。

All of the impacts can be contained within a circle having a 100 meter radius.

所有的弹着点可以囊括在一个半径为100米的圆圈之内.

For circle failure surface, this paper uses GA's theory to search the center of a circle and the radius of it separately, and based on simple Bishop method to compute the safety factor ( F), and compiled program successfully.

针对圆弧形滑动面法，采用嵌套式的遗传算法分别对滑动圆弧的圆心、半径进行遗传进化搜索，基于简化Bishop原理进行稳定系数的计算，成功的编制了程序。

The percentage increase of radius of a circle is 30 %, find the percentage increase its area.

若一圆的半径增加了30%, 则此圆的面积增加了多少巴仙?