Is there a keyboard shortcut to zoom in/out the canvas ?
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https://mathigon.org/course/circles/introduction
The diameter is the distance between two opposite points on a circle. It goes through its center, and its length is twice the radius.
but in chinese
直径 表示圆上两个相对的点的距离。它通过圆心，长度为半径的一半。
it means
The diameter is the distance between two opposite points on a circle. It goes through its center, and its length is half
i think its wrong
