Предмет: Геометрия, автор: mixaliman777

Башня высотой 60 м видна из некоторой точки на местности под углом 30 градусов. Расстояние от этой точки до основания башни примерно равно
НАПИШИТЕ РЕШЕНИЕ ПОЖАЛУЙСТА. ОТВЕТ БУДЕТ 102.

Ответы

Автор ответа: Школььникк008
2

Дано:

BC = 60 м

∠BAC = 30°

Найти:

AC - ?

Решение:

1. Треугольник АВС - прямоугольный ( ∠С = 90° т. к. башня стоит вертикально относительно земли)

Т. к. ∠BAC = 30° , то за свойством стороны которая лежит против угла 30° - BC = 1/2*AB

⇒ AB = 120 м

2. Т. к. треугольник прямоугольный, то за теоремой Пифагора( AB²=AC²+BC²) AC =√AB²-BC²

⇒ AC =√14400-3600

AC=√10800

AC ≈ 103.9

AC ≈ 104

Ответ: 104

Примечания: я хз как там может 102 получиться или ты неправильно условия дал, или в учебнике ошибка.

Приложения:

mixaliman777: написано, что будет верным 102, так что верно дал условия
Школььникк008: в книгах тоже возможны ошибки
Похожие вопросы
Предмет: Русский язык, автор: Eroslav2002
Предмет: Английский язык, автор: Doctormob
Помогите пожалуйста
"*Read the magazine article and do the tasks below.*"

Every good climber wants to climb mountain Everest, 8, 848 metres above the sea level, the highest mountain in the world. It stands between Nepal and Tibet, in the Himalayas. It is, in fact, quite a "young" mountain — only about two million years old. The Tibetans call it Chomolungma, the "Moth er of the World".

Only just over 600 people have ever climbed to the top of Everest. You cannot climb the mountain without special per mission from the government of Nepal; you can only climb it in May or October every year; you must have a booking for your expedition — and at the moment there are no more book ings for the next ten years!

The expeditions which have climbed Everest have all used tents, oxygen bottles and other climbing equipment. Many expeditions have left their old equipment behind them — empty oxygen bottles, old food containers, etc — so there is now a serious litter problem high up on the mountain.

The government of Nepal is now trying to clean up the mountain. In May 1993 they gave permission to a team of young Americans to climb the mountain ... but they asked them to bring back the litter on their way down again. The expedition brought down 2, 850 kilos of litter from the high est slopes of the mountain. This was the start of a plan to clear all the litter from Mountain Everest.

A Write down whether the following statements are true or false.

*
Everest is less than 1, 100 metres high.

*
It is in the Alps.

*
500 people have climbed it.

*
People can climb it from May to October.

B Answer the following questions.

*
Can you book an expedition to Everest now?

*
Why is there a serious litter problem?

*
How did the government start to exercise their programme?
Предмет: География, автор: асим267