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Автор - dhsusbabak249

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Ответ

Автор - lialiaka55

АВ=ВС => ΔАВС- равнобедренный => ∠А=∠С=51°

∠А+∠В+∠С= 180°

51+51+ ∠С=180°

102+∠С=180

∠С=180-102

∠С=78°

Ответ: 78°

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