Предмет: Геометрия, автор: Аноним

Высота конуса равна 10 см. Образующая конуса наклонена к плоскости основания под углом 30*. Найти площадь боковой поверхности.

Ответы

Автор ответа: mukus13

1

SO=10
Sбок=πRL
R=OB
L=SB
<SBO=30
SB=2*SO=2*10=20
$\frac{OB}{SB}=cos30$
$2*OB=20$
OB=10
Sбок=π*10*20=200π

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: SofiaOvchinnikova

На конце глагол с буквой ч ставится мягкий знак?

2 года назад

Предмет: Английский язык, автор: vadimviktorov06

1-Read this text. A STRANGE EXPERIENCE Last month I was on holiday in Ireland with my mum and dad. One day, we were driving through a small village. It was time for lunch, so we stopped at a restaurant . It was a large , old builiding. We looked through the window. There were lots of people in the restaurant. They were eating , drinking and chatting . A musician was playing the violin. But there was something strange about the people . They weren't wearing normal , modern clothes. They were wearing hats, jackets and dresses from another century . We couldn't understand it. But we were hungry , so we opened the door . When we went into the restaurant, everything was different. The people were wearing normal clothes. The musician wasn't there- the music was on CD. It was a very strange experience ! Daniel 1- What were the people in the restaurant doing ? 2- What instrument was the musician playing ? 3- What was strange about their cl

2 года назад

Предмет: Русский язык, автор: dashalubenkova

Подскажите пожалуйста!
Рассказывать, думали, подсунул, состроил, сделал, поверила, поверили, делал, думаю - какие из этих слов в настоящем времени?

2 года назад

Предмет: Алгебра, автор: 8241243

Помогите пожалуйста решить

7 лет назад

Предмет: Математика, автор: bratishkina

$3x {}^{2} - 25 > 0$
ПОМОГИТЕ ПОЖАЛУЙСТА Я НЕ ПОНИМАЮ АЛГЕБРУ !!!!

7 лет назад