Two congruent circles centered at points $A$ and $B$ each pass through the other circle's center. The line containing both $A$ and $B$ is extended to intersect the circles at points $C$ and $D$ . The circles intersect at two points, one of which is $E$ . What is the degree measure of $\angle CED$ ?
A. 90
B. 105
C. 120
D. 135
E. 150

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Worked solution

1. 2016 AMC 8 官方解析

翻译：两个全等圆的圆心分别是A和B，并且每个圆分别过另一个圆心，过A和B的直线分别于两个圆交于C、D两点，两个圆的交点中有一个是E点，那么CED的度数是（）。

Answer

C. 120

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