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7.4: Кути трикутників
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$\measuredangle ABC + \measuredangle BCA + \measuredangle CAB \equiv \pi.$ $\measuredangle CAX \equiv \measuredangle CAB + \measuredangle ABC$ \(|\measuredangle ABC| + |\measuredangle BCA| + |\mea... $\measuredangle ABC + \measuredangle BCA + \measuredangle CAB \equiv \pi.$ $\measuredangle CAX \equiv \measuredangle CAB + \measuredangle ABC$ $|\measuredangle ABC| + |\measuredangle BCA| + |\measuredangle CAB| = \pi$ Набір $\alpha = \measuredangle CAB$ , $\beta = \measuredangle ABC$ , і $\gamma = \measuredangle BCA$ . $\measuredangle ABC + \measuredangle BCD + \measuredangle CDA + \measuredangle DAB \equiv 0$ .