Предмет: Геометрия, автор: fggdgvddfht1334

помогите плиз
надо решить до среды за рание спасибо

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Автор ответа: dnepr1

9) Обозначим каждую из равных сторон треугольника за х. Тогда третья сторона (она в тупоугольном треугольнике больше первых двух) равна х + 9.
Составим уравнение периметра Р = х + х + (х+9).
45 = 3х + 9
3х = 45 - 9 = 36
х = 36 / 3 = 12 см.
10) Угол АСВ =( 360-110) / 2 = 250 / 2 = 125 градусов.

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