Предмет: Геометрия, автор: annablonskaya888

Помогите, пожалуйста, надо доказать по-поводу треугольников.

Например так:

Розглянемо ΔABD і ΔCBD , у яких BD - спільна сторона , AB = CD і ∠ABD=∠CBD - за умовою . Тоді ΔABD = ΔCBD за двома сторонами і

кутом між ними ( І ознака рівності трикутників ) .

Так надо надо написать смотря на фото ниже. Пожалуйста напишите так как по образцу.
Очень нужно ..... Срочно!

Приложения:

annablonskaya888: Напишите, так как по образу, пожалуйста
annablonskaya888: вернее по образцу

Ответы

Автор ответа: siestarjoki
1

Рассмотрим треугольники △ADB и △CDB.

Стороны AD и CD равны по условию.

Сторона BD общая.

Углы ∠ADB и ∠CDB равны по условию.

Следовательно, треугольники △ADB и △CDB равны по двум сторонам и углу между ними.

△ADB, △CDB: AD=CD, ∠ADB=∠CDB (по условию), BD - общая

=> △ADB и △CDB (по двум сторонам и углу между ними)


annablonskaya888: Спасибо
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