这个圆的圆心在这里。

The center of the circle is here.

我们从圆心开始画这个圆。

We start drawing this circle from the center of the circle.

圆心是这个圆的最重要部分。

The center of the circle is the most important part of this circle.

我们需要找到这个圆的圆心。

We need to find the center of the circle.

你能帮我标出这个圆的圆心吗？

Can you help me mark the center of the circle?

在圆中，圆心角由两条半径形成。

In a circle, a central angle is formed by two radii.

你能计算这个圆心角的度数吗？

Can you calculate the degree of this central angle?

这个几何题要求我们找到圆心角。

This geometry problem asks us to find the central angle.

在圆周运动中，向心的力作用于圆心。

In a circular motion, the centripetal force acts towards the center of the circle.

圆心角的度数等于其所对弧的度数。

The degree of a central angle is equal to the degree of its intercepted arc.