middle line into two trapezoids
Объяснение:
https://www.sparkblue.org/content/123movies-watch-cherry-2021-online-full-movie-hd-free-2
https://www.sparkblue.org/content/123movies-watch-dark-web-cicada-3301-2021-online-full-movie-hd-free
https://www.sparkblue.org/content/123movies-watch-long-weekend-2021-online-full-movie-hd-free-0
https://www.sparkblue.org/content/123movies-watch-sas-red-notice-2021-online-full-movie-hd-free
https://www.sparkblue.org/content/123movies-watch-unbearable-weight-massive-talent-2021-online-full-movie-hd-free-1
https://www.sparkblue.org/content/123movies-watch-trust-2021-online-full-movie-hd-free
https://www.sparkblue.org/content/123movies-watch-below-zero-2021-online-full-movie-hd-free-0
https://www.sparkblue.org/content/123movies-watch-tom-jerry-2021-online-full-movie-hd-free
https://www.sparkblue.org/content/123movies-watch-wrong-turn-2021-online-full-movie-hd-free-2
https://www.sparkblue.org/content/123movies-watch-little-things-2021-online-full-movie-hd-free-4
https://www.sparkblue.org/content/123movies-watch-monster-hunter-2021-online-full-movie-hd-free-0
https://www.sparkblue.org/content/123movies-watch-judas-and-black-messiah-2021-online-full-movie-hd-free-1
https://www.sparkblue.org/content/fullwatch-judas-and-black-messiah-2021-online-movie-free-123movies
https://www.sparkblue.org/content/fullwatch-dark-web-cicada-3301-2021-online-movie-free-123movies
https://www.sparkblue.org/content/fullwatch-trust-2021-online-movie-free-123movies
https://www.sparkblue.org/content/fullwatch-below-zero-2021-online-movie-free-123movies
https://www.sparkblue.org/content/fullwatch-tom-jerry-2021-online-movie-free-123movies
https://www.sparkblue.org/content/fullwatch-wrong-turn-2021-online-movie-free-123movies
https://www.sparkblue.org/content/fullwatch-monster-hunter-2021-online-movie-free-123movies
https://indexanom-emon.cookpad-blog.jp/articles/578060
https://paiza.io/projects/IAQuMPR_eARebYIfm3oLcA
https://paiza.io/projects/WZYx8bZWCAXhEgoYC237Og?language=php
https://caribbeanfever.com/profiles/blogs/hangtdmenenan-tahi
https://paiza.io/projects/wanFWWaHo4Q8E5GGVmqh1Q?language=php
https://indexanom-emon.cookpad-blog.jp/articles/578065
См. Объяснение
Объяснение:
№ 7
1) ВС = АВ = 10
2) МС = √(ВС² - МВ²) = √(10² - 8²) = √(100 -64) = √36 = 6
3) S АВС = АВ · МС : 2 = 10 · 6 : 2 = 60 : 2 = 30.
ответ: 30.
№ 8
1) Периметр Р треугольника:
13+14+15 = 42
2) Полупериметр p треугольника:
р = Р : 2 = 42 : 2 = 21
3) Площадь треугольника, согласно формуле Герона:
S = √((21 · (21-13)·(21-14)·(21-15)) = √(21·8·7·6) = √7056=84
4) S = 14 · h : 2
84 = 14 · h : 2
168 = 14 · h
h = 168 : 14
h = 12
ответ: h = 12
№ 9
1) Так как СD - AD = 11, то
CD = AD + 11
2) BD² = AB²- AD² = 13² - AD² = 169 - AD²
BD² = BC² - CD² = 20² - (AD + 11)² = 400 - AD² - 22AD -121
169 - AD² = 400 - AD² - 22AD -121
22AD = 400 - 121 - 169 = 110
AD = 110 : 22 = 5
3) CD = AD + 11 = 5 + 11 = 16
4) АС = AD + CD = 5 + 16 = 21
5) BD = √(AB²- AD²) = √(13²-5²) = √(169-25) = √144 = 12
6) S АВС = АС · BD : 2 = 21 · 12 : 2 = 126
ответ: S АВС = 126
№ 10
1) Пусть СМ = МВ = х, тогда СВ = 2х
2) АС² = АВ² - СВ² = 5² - (2х)² = 25 - 4х²
АС² = АМ²-СМ²= (√13)²- х² = 13 -х²
25 - 4х² = 13 -х²
- 4х² + х² = 13 - 25
- 3х² = - 12
х² = 12 : 3 = 4
х = √4 = 2
3) СВ = 2х = 2 · 2 = 4
4) АС = √( АВ² - СВ²) =√(5² - 4²) = √(25-16) =√9 =3
5) S АВС = СВ · АC : 2 = 4 · 3 : 2 = 12 : 2 = 6
ответ: S АВС = 6
