对于圆心角、弧、弦、弦心距之间的关系,我们有以下定理和推论.定理:在同圆和等圆中,相等的圆心角所对的弧相等,所对的弦相等,所对的弦的弦心距相等.推论:在同圆和等圆中,如果两个圆心角、两条弧、两条弦或两条弦的弦心距中有一组量相等,那么它们所对应的其余各组量都分别相等. For the relationship between the central angle, the arc, the string, and the string center distance, we have the following theorems and corollaries. Theorem: In the same circle and equal circle, the equal arc angles of the central angles are equal, and the strings are equal. The chords of the opposite string have the same center distance. Corollary: In the same circle and equal circle, if there is a group of equal amounts in the center of the circle, two arcs, two strings, or two strings, their corresponding The rest of the groups are equal.