Level 12
Level 13


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circle
arc
center
中心
chord
radius
半径
diameter
直径
circumference
圆周长
radian
弧度(弧长/半径)
clockwise
顺时针
counterclockwise
逆时针
inscribe
内接
circumscribe
外接 外切
concentric circle
同心圆
tangent
切线