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几何

正十七边形​

参考资料​

效果展示​

https://www.desmos.com/geometry/07b535ea2b

三圆公切线​

参考资料​

效果展示​

https://www.desmos.com/geometry/8679c2f382

参考资料​

效果展示​

https://www.desmos.com/geometry/10c2292e47

中国国旗​

参考资料​

效果展示​

https://www.desmos.com/geometry/52455eb545