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20.3: Визначення площі
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умови\[\begin{array} {ccc} {\mathcal{P} \cong \mathcal{Q}} & \Rightarrow & {\text{area } \mathcal{P} = \text{area } \mathcal{Q};} \\ {\mathcal{P} \subset \mathcal{Q}} & \Rightarrow & {\text{area } \ma...умови\[\begin{array} {ccc} {\mathcal{P} \cong \mathcal{Q}} & \Rightarrow & {\text{area } \mathcal{P} = \text{area } \mathcal{Q};} \\ {\mathcal{P} \subset \mathcal{Q}} & \Rightarrow & {\text{area } \mathcal{P} \le \text{area } \mathcal{Q};} \\ {\text{area } \mathcal{P} + \text{area } \mathcal{Q}} & = & {\text{area } (\mathcal{P} \cup \mathcal{Q}) + \text{area } (\mathcal{P} \cap \mathcal{Q})} \end{array}\] дотримуються для будь-яких двох багатокутних множин\(\mathcal{P}\) і\(\mathcal{Q}\).