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  • 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%95%D0%BB%D0%B5%D0%BC%D0%B5%D0%BD%D1%82%D0%B0%D1%80%D0%BD%D0%B0_%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D1%96%D1%8F_%D0%BA%D0%BE%D0%BB%D0%B5%D0%B4%D0%B6%D1%83_(Africk)/03%3A_%D0%A7%D0%BE%D1%82%D0%B8%D1%80%D0%B8%D0%BA%D1%83%D1%82%D0%BD%D0%B8%D0%BA%D0%B8/3.01%3A_%D0%9F%D0%B0%D1%80%D0%B0%D0%BB%D0%B5%D0%BB%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%B8
    \(w^{\circ} = 115^{\circ}\)так як протилежні кути паралелограма рівні. \(x^{\circ} = 180^{\circ} -(w^{\circ} + 30^{\circ}) = 180^{\circ} - (115^{\circ} + 30^{\circ}) = 180^{\circ} - 145^{\circ} = 35^{...\(w^{\circ} = 115^{\circ}\)так як протилежні кути паралелограма рівні. \(x^{\circ} = 180^{\circ} -(w^{\circ} + 30^{\circ}) = 180^{\circ} - (115^{\circ} + 30^{\circ}) = 180^{\circ} - 145^{\circ} = 35^{\circ}\), Тому що сума кутів\(\triangle ABC\) є\(180^{\circ}\),\(y^{\circ} = 30^{\circ}\) і\(x^{\circ} = x^{\circ} = 35^{\circ}\) тому що вони чергуються внутрішні кути паралельних ліній.