A curve called cardioid is one of the most famous and widely discussed plane curves in mathematics. After stating the definition we focus mainly on its geometric properties and presentations in connection with its tangents. This leads us to the example of an occurrence of the cardioid in everyday life.
In the second part of this thesis we place the cardioid in the complex plane, identified with ${\mathbb R}^2$. We derive Morley's theorem for triangles through the properties of cardioid’s tangent lines as Frank Morley did in his studies. In passing we will say a few words about the historical context and the life of the discoverer.
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