Предмет: Математика, автор: pil1

высота правильной треугольной призмы равна 16 см, стороны основания 3√3. найти площадь и обьем призмы.

Ответы

Автор ответа: Reychll
0
Высота правильной пирамиды проходит через центр окружности, описанной около основания. Так как основание данной пирамиды — квадрат, то О — точка пересечения диагоналей. Так что Далее, в прямоугольном ΔSOC по теореме Пифагора находим Ответ: 9 см.
Похожие вопросы
Предмет: Английский язык, автор: sanek0703
Bradley had always wanted to be an artist. It was something he'd fantasised 32 _ , but had never really explored. He decided, though, that he could still try.

He wanted to enrol in a painting class at a local college, but he ran into a problem. £You have to take our design and drawing courses first,’ the administrator told him. Luckily it wasn’t too late to take those courses, but it meant that Bradley would have to 33 _ aside twice as much time per week as he’d intended. Nevertheless, he was excited to learn the skills.

His design course proved to be challenging, but manageable. The drawing course, however, 34 _ off easily but soon became frustrating. In the fourth week, the participants had to draw one another.

Bradley drew a portrait of his classmate, Nicole. He 35 _ intensely at her face, trying to draw the nose, eyes and cheeks correctly but the portrait ended up looking more like that of an orang-utan. I'm sorry you look much nicer than that!’ he said.

'It’s OK,’ Nicole replied, showing Bradley her drawing. He was relieved to see that her portrait of him looked like the orang-utan’s brother. ‘Looks as if getting facial 36 _ correct is trickier than we thought,’ she joked.

While frustrated at times, Bradley persisted 37 _ his artwork.

By the end of the courses, he had some accomplishments proudly 38 _ in his home, and others that were tossed into the recycling bin.

32 1) above 2) about 3) across 4) around

33 1) make 2) take 3) place 4) put

34 1) opened 2) entered 3) began 4) started

35 1) observed 2) stared 3) glanced 4) browsed

36 1) features 2) elements 3) marks 4) traits

37 1) of 2) on 3) with 4) to

38 1) stated 2) displayed 3) positioned 4) located
Предмет: Математика, автор: tzigane2011