That is a circle of radius 1. That's the unit circle.
是一个半径为1的圆，那是单位圆。
I am trying to solve, actually, for the radius of the circle.
我是在试着，去解圆的半径。
So, this is a piece of a circle of radius a.
这是这个圆的一小部分。
R And let the circle have a radius r.
这个圆环的半径是。
R You go around a circle which has radius r.
你绕圈的半径为。
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。
Next, create an SPL function that returns the area of a circle given its radius.
接着，创建一个spl函数，它将返回给定半径的圆的面积。
What is the radius of this circle?
这个圆的半径有多长？
The radius of a circle is 4cm, how many square centimeters is its area?
一个圆的半径是4厘米，它的面积是多少平方厘米？
Drag to add a circle defined by radius.
拖动此形状，可添加一个由半径定义的圆。
We are measuring the radius of the circle.
我们正在测量圆的半径。
We are measuring the radius of the circle.
我们正在测量圆的半径。
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