平面曲线是位于单个平面内的曲线。平面曲线可以是闭合的或开放的。由于某些原因而有趣且其性质已被研究的曲线被称为“特殊”曲线（Lawrence 1972）。一些最常见的开放曲线是直线、抛物线和双曲线，而一些最常见的闭合曲线是圆和椭圆。
平面曲线
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参考文献
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平面曲线请引用为
韦斯坦因，埃里克·W. “平面曲线。” 来自 MathWorld——Wolfram Web 资源。 https://mathworld.net.cn/PlaneCurve.html