Предмет: Геометрия, автор: sofianikiforova98

В треугольнике АВС биссектриса угла А делит высоту, проведённую из вершины В, в отношении 13 : 12, считая от точки В. Найдите радиус окружности, описанной около треугольника АВС, если ВС = 35.

Ответы

Автор ответа: siestarjoki

По теореме о биссектрисе

AB/AH =BE/EH =13/12

cosA =AH/AB =12/13

sinA =√(1-cosA²) =5/13

По теореме синусов

BC/sinA =2R => R=35*13/5*2 =45,5

Приложения:

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Алгебра, автор: instagramrylut

У вантажівку завантажено ящики двох видів.Вантаж важить 3810 кг, а його обʼєм становить 4000 літрів.
Маленька коробка: обсяг-25; кг-30
велика коробка:обсяг-60; кг-50
Зі скількох малих і скількох великих ящиків складається вантаж?

1 год назад

Предмет: Математика, автор: mujqanveliyeva0101

В прямоугольном треугольнике
АВС из вершины прямого угла
С проведена высота CD.
Найдите катет ВС, если
DM AC прямой угол, DN BC прямой угол, DM=3 cM, DN=6 cM.
A) 10 см
B) 9 см
M
C) 8 см
D) 15 см
E) 5 см

1 год назад

Предмет: Английский язык, автор: mmirdobra

a) Grammar
61) I don't feel like taking part in this doubtful affair. RATHER
part in this doubtful affair. (4)
I
62) You should change your attitude to Harry. TIME
It's
change you attitude to Harry.
63) Please, be more careful about your workouts. WANT
I
more careful about your workouts. (4)
64) Don't go out, wait for your father. UNTIL
Don't go out
home. (4)
65) And, in your place, I wouldn't turn to Sam for help. WERE
And,
I wouldn't turn to Sam for help. (4)

1 год назад

Предмет: Английский язык, автор: nmi34092

д.з.
Раскройте скобки, чтобы получились истории в Past Simple
1. Last week I __ (to phone) my best friend Joe and __ (to start) telling him everything that ___ (to happen) to me. I __ (not to want) to forget anything, so I __ (to decide) to write some things down. I __ (to remember) every little detail of my week and __ (to continue) talking, but Joe __ (not to listen). He fell asleep!

2. Two summers ago we __ (have) a holiday in Scotland. We___ (drive) there from London. When we ___ (get) to Edinburgh we __ (not find) a good hotel. We __ (not know) what to do, but in the end we __ (find) a motel and __ (stay) there for the week. We __ (see) the castle, __ (go) to the Arts Festival, and __ (buy) a lot of souvenirs.

УПРАЖНЕНИЯ оборот There is/are
Упражнение 1.
Раскройте скобки, выбрав нужную форму глагола и подчеркните подлежащее и сказуемое.
1. There (is, are) a large table in my room.
2. There (is, are) three windows in my classroom.
3. There (is, are) a table and four chairs in my living-room.
4. There (is, are) a blackboard, four desks and five chairs in our class-room.
5. There (is, are) a text-book and two exercise-books on the table.
6. There (is, are) two shops and a cinema in my street.
Упражнение 2.
Перепишите предложения в вопросительной и отрицательной форме.
Образец
1. There was a small shop in my street last year. Was there a small shop in my street last year? There was no small shop in my street last year.
2. There were two books at the table. Were there two books on the table? There weren’t two books on the table.
1. There were a lot of flowers in the garden.
2. There was an apple-tree in the garden.
3. There were a lot of chickens on the farm.
4. There were many white sheep on the farm.
5. There was a table at the window.
6. There was a bus stop here.

Упражнение 3.
Прочитать вслух, сделать предложения отрицательными и вопросительными
1. There is an apple on the table.
2. There is a banana on the table.
3. There is a sausage on the table.
4. There is a pear on the table.
5. There is an orange on the table.
6. There is a bread roll on the table.
7. There is a biscuit on the table.
8. There is an egg on the table.
9. There is a cucumber on the table.
10. There is a tomato on the table.
Упражнение 4.
1.Используйте There (is, are)

1. ______ nice flowers in the room.
2. ______ a red vase on the table.
3. ______ chairs next to the table.
4. _______ a mouse in the yard.
5. ______ books in the bag .
6. _______ balls under the table .
7. _______ a mirror in the bedroom.
8. ______ pens on the book.
9. ______ bridges in the town.
Сегодня мы повторяем глаголы must и have to.
1. You … open the window. It is cold.
2. I … get up earlier today. We are going on an excursion.
3. We … clean the floor. It’s very dirty.
4. You … buy cinema tickets. I can’t buy them.
5. We … visit granny. She is ill.
6. I … come back before 6 o’clock.
7. We … come to school on time.
8. I … go by bus. Dad will drive me.
9. You … go shopping. We have some bread for dinner.
10. You … help your friend.

ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО! ! !
только все номера

7 лет назад

Предмет: Алгебра, автор: mixfilin132

(x−4)(x+4)−(x−2)^ 2
при x=−2,25

7 лет назад