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11.4: Дефект
https://ukrayinska.libretexts.org/%D0%9C%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D1%96%D1%8F/%D0%84%D0%B2%D0%BA%D0%BB%D1%96%D0%B4%D0%BE%D0%B2%D0%B0_%D0%BF%D0%BB%D0%BE%D1%89%D0%B8%D0%BD%D0%B0_%D1%96_%D0%B9%D0%BE%D0%B3%D0%BE_%D1%80%D0%BE%D0%B4%D0%B8%D1%87%D1%96_(Petrunin)/11%3A_%D0%9D%D0%B5%D0%B9%D1%82%D1%80%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0_%D0%BF%D0%BB%D0%BE%D1%89%D0%B8%D0%BD%D0%B0/11.04%3A_%D0%94%D0%B5%D1%84%D0%B5%D0%BA%D1%82
$\text{defect} (\triangle ABC) := \pi - |\measuredangle ABC| - |\measuredangle BCA| - |\measuredangle CAB|.$ \(\text{defect} (\triangle ABC) = \text{defect} (\triangle ADC) + \text{defect} (\triangl... $\text{defect} (\triangle ABC) := \pi - |\measuredangle ABC| - |\measuredangle BCA| - |\measuredangle CAB|.$ $\text{defect} (\triangle ABC) = \text{defect} (\triangle ADC) + \text{defect} (\triangle DBC).$ $\text{defect} (\triangle ABC) = \text{defect} (\triangle AXC).$ $\text{defect} (\triangle ABC) + \text{defect} (\triangle CDA) = 0.$ $\text{defect} (\triangle ABC) = \text{defect} (\triangle CDA = 0$ За АСА $\triangle ABC \cong \triangle CDA$ , і, зокрема, $AB =CD$ .