Предмет: Геометрия, автор: steklo150

Как расположены относительно друг
друга две окружности, если расстояние
между их центрами равно: а) 15 см, а
радиусы равны 9 см и 7 см; б) 8 см, а
диаметры равны 20 см и 2 см?
подробное решение,пожалуйста

Ответы

Автор ответа: JuliaRichie
5
а) они заходят друг на друга, т.к. сумма радиусов 9+7 = 16 больше расстояния между ними 16>15

б) радиус окружности равен половине диаметра, т.е. радиусы равны 2/2=1 и 20/2=10, 1+10=11 - сумма радиусов, 11>8, значит ээти окружности тоже заходят друг на друга
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Прочитайте текст. Определите, какие из приведенных утверждений А5—А8 соответствуют содержанию текста:(1 — True), какие не соответствуют (2 — False) и о чем в тексте не сказано, то есть на основании текста нельзя дать ни положительного, ни отрицательного ответа (3 — Not stated).
Hobby is what people like doing in their free time. Most people choose a hobby according to their likes and dislikes. There are a lot of different hobbies. For some teenagers there is nothing more important than dancing. It's really good fun and enjoyable. Some teenagers come home and do nothing because they are tired. They like to sit in front of the TV set and watch films. They are a bit of coach potatoes. But a lot of teens go in for sports. It is very good for your health. Sport makes you healthy and fit. If you are not a sporty person, it is a good idea to take up walking. It is just really relaxing to get back to nature, breathe in some fresh air, see some beautiful scenery. You come back really refreshed.
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A5. For some teenagers dancing is the most important thing.
1) True 2) False 3) Not stated
A6. Some teenagers like to sit in front of the TV set and watch films because they have nothing to do.
1) True 2) False 3) Not stated
A7. Playing computer games is very bad for teenagers' health.
1) True 2) False 3) Not stated
A8. But the most popular hobby is, of course, listening to birds.
1) True 2) False 3) Not stated