background top icon
background center wave icon
background filled rhombus icon
background two lines icon
background stroke rhombus icon

Download "Третий признак подобия треугольников | Геометрия 7-9 класс #61 | Инфоурок"

input logo icon
Video tags
|

Video tags

инфоурок
школа
видеоуроки
геометрия
Subtitles
|

Subtitles

subtitles menu arrow
  • ruRussian
Download
00:00:00
third sign of similarity of triangles
00:00:03
theorem if three sides of one
00:00:07
triangle are proportional to three
00:00:09
sides of another then such triangles are
00:00:11
similar proof
00:00:15
let the sides of triangles a b c and 1 b
00:00:19
1 c 1 be
00:00:20
proportionally prove that triangle
00:00:23
a b c
00:00:24
is similar to triangle 1 b 1 c 1 for this,
00:00:29
taking into account the second sign of similarity of
00:00:31
triangles, it is enough to prove that
00:00:33
angle a is equal to angle a one, consider
00:00:38
triangle a b c 2 in which angle 1 is
00:00:42
equal to angle and one angle 2 is equal to angle b1
00:00:48
triangles a b c 2 and 1 b 1 c 1
00:00:53
similar according to the first criterion of similarity of
00:00:55
triangles
00:00:57
therefore abe relates to one to one as
00:01:01
bc2
00:01:02
relates to b 1 c 1 as c2 a relates to
00:01:09
c11 comparing these equalities we get that
00:01:14
is b c equals b c2c
00:01:18
a equals c2 about the triangle a b c and a b c
00:01:24
2
00:01:25
are equal on three sides, it follows
00:01:29
that angle a is equal to angle 1 and since angle 1
00:01:33
is equal to angle one
00:01:35
then angle a is equal to angle one, the theorem
00:01:40
is proven

Description:

Видеоуроки являются идеальными помощниками при изучении новых тем, закреплении материала, для обычных и факультативных занятий, для групповой и индивидуальной работы. Они содержат оптимальное количество графической и анимационной информации для сосредоточения внимания и удержания интереса ребят без отвлечения от сути занятия. Каждый видеоурок озвучен профессиональным мужским голосом, четким и приятным для восприятия. Ученики ценят оригинальность подачи материала, родители радуются повышению отметок детей, а учителя в восторге от эффекта и экономии времени и денег при подготовке к урокам. ★Инфоурок★ Крупнейший в России образовательный онлайн-проект МЫ ПРЕДЛАГАЕМ: ✓ Курсы дополнительного образования детей и взрослых: https://infourok.ru/ ✓ Тесты для учителей и воспитателей: https://infourok.ru/tests ✓ Самые массовые международные дистанционные олимпиады: https://infourok.ru/konkurs ✓ Видеоуроки по 14 предметам: https://school.infourok.ru/videouroki?authChecked=true ✓ Каталог репетиторов: https://school.infourok.ru/?authChecked=true ✓ Библиотека методических материалов для учителей: https://infourok.ru/biblioteka Адрес редакции и издательства: 214011, РФ, г. Смоленск, ул. Верхне-Сенная, 4. [email protected] © 2012–2017 Издатель: Проект «Инфоурок»

Preparing download options

popular icon
Popular
hd icon
HD video
audio icon
Only sound
total icon
All
* — If the video is playing in a new tab, go to it, then right-click on the video and select "Save video as..."
** — Link intended for online playback in specialized players

Questions about downloading video

mobile menu iconHow can I download "Третий признак подобия треугольников | Геометрия 7-9 класс #61 | Инфоурок" video?mobile menu icon

  • http://unidownloader.com/ website is the best way to download a video or a separate audio track if you want to do without installing programs and extensions.

  • The UDL Helper extension is a convenient button that is seamlessly integrated into YouTube, Instagram and OK.ru sites for fast content download.

  • UDL Client program (for Windows) is the most powerful solution that supports more than 900 websites, social networks and video hosting sites, as well as any video quality that is available in the source.

  • UDL Lite is a really convenient way to access a website from your mobile device. With its help, you can easily download videos directly to your smartphone.

mobile menu iconWhich format of "Третий признак подобия треугольников | Геометрия 7-9 класс #61 | Инфоурок" video should I choose?mobile menu icon

  • The best quality formats are FullHD (1080p), 2K (1440p), 4K (2160p) and 8K (4320p). The higher the resolution of your screen, the higher the video quality should be. However, there are other factors to consider: download speed, amount of free space, and device performance during playback.

mobile menu iconWhy does my computer freeze when loading a "Третий признак подобия треугольников | Геометрия 7-9 класс #61 | Инфоурок" video?mobile menu icon

  • The browser/computer should not freeze completely! If this happens, please report it with a link to the video. Sometimes videos cannot be downloaded directly in a suitable format, so we have added the ability to convert the file to the desired format. In some cases, this process may actively use computer resources.

mobile menu iconHow can I download "Третий признак подобия треугольников | Геометрия 7-9 класс #61 | Инфоурок" video to my phone?mobile menu icon

  • You can download a video to your smartphone using the website or the PWA application UDL Lite. It is also possible to send a download link via QR code using the UDL Helper extension.

mobile menu iconHow can I download an audio track (music) to MP3 "Третий признак подобия треугольников | Геометрия 7-9 класс #61 | Инфоурок"?mobile menu icon

  • The most convenient way is to use the UDL Client program, which supports converting video to MP3 format. In some cases, MP3 can also be downloaded through the UDL Helper extension.

mobile menu iconHow can I save a frame from a video "Третий признак подобия треугольников | Геометрия 7-9 класс #61 | Инфоурок"?mobile menu icon

  • This feature is available in the UDL Helper extension. Make sure that "Show the video snapshot button" is checked in the settings. A camera icon should appear in the lower right corner of the player to the left of the "Settings" icon. When you click on it, the current frame from the video will be saved to your computer in JPEG format.

mobile menu iconWhat's the price of all this stuff?mobile menu icon

  • It costs nothing. Our services are absolutely free for all users. There are no PRO subscriptions, no restrictions on the number or maximum length of downloaded videos.