Предмет: Геометрия, автор: sira

в усеченном конусе диагональ осевого сечения равна 10,радиусы оснований 2 и 4.Найдите высоту конуса

Ответы

Автор ответа: Elina12313324211

0

Пусть осевое сечение конуса АВСД. СК - его высота. диаметр ВС = 2 * 2 = 4 см; диаметр АД = 2 * 4 = 8 см; По свойству равноб. трапеции АК = (АД + ВС):2 = 12 : 2 = 6 Рассмотрим треуг-к АСК. угол К = 90 град. Тогда по теор. Пифагора СК^2 = АС^2 - АК^2 = 10^2 - 6^2 = 100 - 36 = 64; СК = 8 см

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Математика, автор: dilnazdoulbaeva88

при каких значениях х имеет смысл выражения

$\sqrt{ - x + 1}$
СРОЧНО

6 лет назад

Предмет: Английский язык, автор: aadjdjdgh

Hello I’m Aliya ! I’m from Shymkent. I love my (dearer koobe)

dear book

So everywhere I go it goes too. I got it as a (esenterp)

The only problem with it is that you cannot access the (terinent)

on it. So I have to do that at home on my (omupretc)

Now I have about 50 books on it. I’m currently reading “Hobbit”. The language is a bit difficult but I like the story.

6 лет назад

Предмет: Английский язык, автор: saniyakz86

Summative assessment for the unit 1.
Task 1. Reading.
Read the text. Are the sentences true (T) or false (F)?

My name’s Ben. My best friend is John. John and I go to the same school. John and I walk to school together, but we’re not in the same class for every subject. John is very good at sports and he plays for the school football team. He likes music and he has guitar lessons, but he’s not very good at playing the guitar.
John lives opposite my house. He lives in a semi-detached house – all the houses in the street are semi-detached. John’s got a brother and a sister. He shares a bedroom with his brother.
They’ve got a TV and a computer in their room. They don’t play computer games very often – they use the computer for their homework. I’ve got my own room in my house, but I haven’t got a TV or a computer in my room.

1 John can play the guitar well. ____
2 John lives in a semi-detached house. ____
3 John has his own room. ____
4 John’s brother does homework on a computer. ____
5 I watch TV in my room. ____
6 John doesn’t shares a bedroom with his brother and sister

Task II. Use of English
Choose the correct words.
1 We are / am from Poland.
2 There is / are a pen on the table.
3 My school isn’t small. She / It is very big.
4 There is /are some cheese in the fridge?
5 The restaurant is/ am opposite the park.
6 There are/ is a lot of students here.
7 This is a good café. It’s / Its name is Brazil.

6 лет назад

Предмет: Алгебра, автор: Lalal

Вопрос №24693

10 лет назад

Предмет: Математика, автор: 89179991010

начерти квадрат со стороной 4 см закрась три четвертых площади сколько квадратных сантиметров ты закрасил

10 лет назад