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Геометрия

Ответы

Борисовна_Дмитриевич1003

Нарисуй равнобедренный прямоугольный треугольник ABC и выполни поворот треугольника вокруг вершины прямого угла A на угол −270°.

Определи периметр фигуры, которая образовалась из обоих треугольников, если длина катета данного треугольника равна 23 см

Объяснение:

Поворот сохраняет расстояние . Т.к. АВ=АС , то

при повороте на -270° : точка В→В₁ , точка С→В ( кстати , поворот на -270° тождественен повороту на +90°). Образовался равнобедренный Δ ВСВ₁ , основанием СВ₁=23*2=46( см) и боковыми сторонами ВС=ВВ₁.  

В ΔАВС , по т. Пифагора найдем гипотенузу  :

АВ =√(23²+23²)=√(2*23²)=23√2≈23*1,41=32,43 (см).

Р(ВСВ₁)=46+2*32,43=110,86 (см).

Если округлить до целых , то   110,86 см≈111 см


Нарисуй равнобедренный прямоугольный треугольник ABC и выполни поворот треугольника вокруг вершины п
jagerlayf

ответ:8, при условии, что у вас опечатка, и внешний больше внутреннего. иначе решений нет.

Объяснение: Сумма внешнего угла и внутреннего угла составляет 180°, внешний угол в 3 раза меньше, пусть х, тогда внутренний 3х, х+3х=180, х=180/4; х=45, внутренний угол 45°*3=135°, сумма всех внешних, взятых по одному при каждой вершине, 360°, значит, число сторон, как и углов, равно 360/135= не есть число натуральное. значит, правильного многоугольника с такими данными не существует.

Если же условие другое. / см. замечание в ответе/, то 360/45=8- сторон.

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