论文标题
Steiner的帽子：与椭圆相关的恒定区三角肌
Steiner's Hat: a Constant-Area Deltoid Associated with the Ellipse
论文作者
论文摘要
相对于边界点M的椭圆形的负踏板曲线（NPC）是3-CUSP闭合曲线，这是Steiner三角肌的仿射图像。在所有中，家庭都有不变的区域，并显示了一系列有趣的特性。
The Negative Pedal Curve (NPC) of the Ellipse with respect to a boundary point M is a 3-cusp closed-curve which is the affine image of the Steiner Deltoid. Over all M the family has invariant area and displays an array of interesting properties.
