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alopavopa
alopavopa
24.05.2022 11:34 •  Геометрия

49. Чи можна розмістити точки A, BiC так, щоб виконувалися рівності: а) АВ = 2,3 см, ВС = 3,5 см, AC = 6,3 см;
б) АВ = 5,1 см, ВС = 3,5 см, AC = 6,8 см;
в) АВ = 3,1 см, ВС = 7,2 см, AC = 10,3 см?

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Ответ:
tim228904
tim228904
24.05.2022

1. Соединим точки С и D с центром. Тогда треугольники AOD и ВОС равнобедренные (OA = OB = OC = OD как радиусы), ⇒

∠1 = ∠2 и ∠3 = ∠4.

∠2 = ∠3 как накрест лежащие при пересечении параллельных прямых AD и ВС секущей АВ. Но тогда в этих треугольниках равны и углы при вершине О. Значит треугольники AOD и ВОС равны по двум сторонам и углу между ними, ⇒

AD = BC.

2. Точки, находящиеся на данном расстоянии от данной прямой а, будут расположены на прямой, параллельной прямой а (красные прямые). В зависимости от расположения прямых задача может иметь одно решение (1), два решения (2) и не иметь решения (3).

4,4(29 оценок)
Ответ:
ника2346олл
ника2346олл
24.05.2022

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