Предмет: Геометрия, автор: vjvjjvvjvj

ПОМОГИТЕ
Пожалуйста, объясните,как это решать, с помощью правила треугольника ?

Приложения:

Ответы

Автор ответа: Vivernar

Ответ:

Б) 10√3

Объяснение:

а * b = |a| * |b| *cos 30° = 5*4* $\frac{\sqrt{3} }{2}$ = 10√3

Ответ Б

Приложения:

vjvjjvvjvj: Спасибо огромное, ничего на дистанте не могу понять, придётся думать, чтоб потом можно было решать ❤

Vivernar: Это просто формула, решай по ней и все будет ок, только по формуле всегда идет модуль, т.к. длина не может быть отрицательной и не важно, какую длину тебе дали по условию - ставь ее в модуль по формуле

vjvjjvvjvj: Хорошо, учту, спасибо вам

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