Предмет: Математика, автор: Killergrand

В треугольнике abc угол B=62 градусов,а угол A= на 20 градусов меньше угла C.Найдите градусную меру угла А и определите вид треугольника ABC.
Просьба с x решите.

Ответы

Автор ответа: seleznev11
0
Пусть А =х градусов тогда С= х-20 Сумма всех углов равна 180 получаем уравнение:
х+х-20+62=180
2х+42=180
2х=180-42
2х=138
х=138/2
х=69
Угол А равен 69 градусов
Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Английский язык, автор: lvolonets
1. Mary....French for two years. *
has learnt
has been learning
is learning
2. I....this car for more than ten years. *
have been driving
have driven
am driving
3. Hello, Tom. I ... for you all morning. Where have you been? *
have been looking
am looking
have looked
4. Why ...you ... at me like that? Stop it! *
have/been/looking
are/looking
have/looked
5. We always go to Italy for our holidays. We ...there for years. *
are going
have gone
have been going
6. I ... about what you said and I've decided to take your advice. *
am thinking
have been thinking
have thought
7. Is Ann on holiday this week? - No, she ... *
is working
has worked
has been working
8. Sam is very tired. He ... very hard recently. *
has been working
is working
has worked
9. The road is very wet. It ...for hours. *
is raining
has been raining
has rained
10. He ...ill for a few days. *
has been feeling
has felt
is feeling
Помогите пожалуйста
6 лет назад
Предмет: Математика, автор: vgorskova696
3y2x + 6x · 3y - 2y + 2yxy;

упростить выражение
​
6 лет назад
Предмет: Другие предметы, автор: tfilimonenko7
характеристика тонкого и толстого по персанажем​
6 лет назад
Предмет: Математика, автор: Няшки
Приведите к наименьшему общему знаменателю дроби:
3/16 и 2/3;  1/4 и 9/25;  7/15 и 5/9;  1/6 и 3/10;  5/12 и 7/15;  7/20 и 7/8.
9 лет назад
Предмет: Алгебра, автор: angelina100300

Какое выражение равно выражению (-3X-7)2?    2-это вторая степень

 

а) (3X-7)2

б) (7-3X)2

в) -(3X+7)2

г) (3X+7)2
9 лет назад