Http://world-surf.com/forum/surf-roulette/72959//
https://www.mydigoo.com/forums-topicdetail-138279.html
https://caribbeanfever.com/photo/
https://thriveglobal.com/events/123movies-full-watch-the-wretched-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-365-dni-365-days-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-bad-boys-for-life-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-1917-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-sonic-the-hedgehog-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-jumanji-the-next-level-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-birds-of-prey-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-dolittle-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-little-women-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-the-invisible-man-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-the-call-of-the-wild-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-onward-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-extraction-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-frozen-ii-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-just-mercy-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-parasite-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-fantasy-island-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-the-grudge-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-underwater-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/123movies-full-watch-my-hero-academia-heroes-rising-movie-2020-free-download-1080p/?preview=true
https://thriveglobal.com/events/free-download-dharala-prabhu-full-movie-in-tamil-harish-kalyan/?preview=true
https://thriveglobal.com/events/free-download-asuraguru-full-movie-in-tamil-vikram-prabhu/?preview=true
https://thriveglobal.com/events/free-download-world-famous-lover-full-movie-in-tamil-vijay-deverakonda/?preview=true
https://thriveglobal.com/events/free-download-oh-my-kadavule-2020-full-movie-in-tamil-ashok-selvan/?preview=true
https://thriveglobal.com/events/free-download-bheeshma-2020-full-movie-in-telugu-rashmika-mandanna/?preview=true
https://thriveglobal.com/events/free-download-local-boy-2020-full-movie-in-telugu-dhanush/?preview=true
https://thriveglobal.com/events/free-download-vasantha-kalam-2020-full-movie-in-telugu-nayantara/?preview=true
https://thriveglobal.com/events/free-download-365-dni-365-days-2020-full-movie-in-eng-sub-michele-morrone/?preview=true
https://thriveglobal.com/events/free-download-angrezi-medium-2020-full-movie-in-hindi-irrfan-khan-2/?preview=true
https://thriveglobal.com/events/free-download-baaghi-3-2020-full-movie-in-hindi-tiger-shroff/?preview=true
https://thriveglobal.com/events/free-download-chal-mera-putt-2-full-movie-in-punjabi-amrinder-gill/?preview=true
https://thriveglobal.com/events/free-download-thappad-2020-full-movie-in-hindi-taapsee-pannu/?preview=true
https://thriveglobal.com/events/free-download-paatal-lok-full-web-series-in-amazon-prime/?preview=true
https://thriveglobal.com/events/free-download-shubh-mangal-zyada-saavdhan-full-movie-in-hindi-ayushmann-khurrana/?preview=true
https://thriveglobal.com/events/free-download-love-aaj-kal-2020-full-movie-in-hindi-kartik-aaryan/?preview=true
https://thriveglobal.com/events/free-download-malang-2020-full-movie-in-hindi-aditya-roy-kapur/?preview=true
https://thriveglobal.com/events/free-download-bhoot-part-one-2020-full-movie-in-hindi-vicky-kaushal/?preview=true
Периметр ромба равен 8 м.
Объяснение:
В ромбе диагонали взаимно перпендикулярны и являются биссектрисами углов. Следовательно ∠KEL = ∠EKL.
∠EOA = ∠EKL (дано). =>
∠KEL = ∠EAO => треугольник EOA равнобедренный.
Кроме того, АВ║LK║EF (так ∠EOA = ∠EKL соответствкнные углы при АВ и LK и секущей ЕК).
Значит ЕА = АО =1м.
АО = ОВ (так как точка О - точка пересечения диагоналей ромба).
AEFB - параллелограмм (так как АВ║EF и EA║FB). =>
EF =AB = 2·AO = 2 м.
Итак, сторона ромба равна 2м, тогда его периметр равен 8м (стороны ромба равны).
↑АС = ↑р = ↑а + ↑b
↑DB = ↑q = ↑a - ↑b
Чтобы найти угол между векторами p и q, построим вектор, равный вектору q, с началом в точке А.
∠ЕАС - искомый.
Из ΔABD найдем длину вектора q по теореме косинусов:
|↑q|² = AB² + AD² - 2·AB·AD·cos60° = 25 + 64 - 2·5·8·1/2 = 89 - 40 = 49
|↑q| = 7
Сумма углов параллелограмма, прилежащих к одной стороне, равна 180°, значит ∠АВС = 120°.
Из ΔABС найдем длину вектора р по теореме косинусов:
|↑p|² = AB² + BC² - 2·AB·BC·cos120° = 25 + 64 + 2·5·8·1/2 = 89 + 40 = 129
|↑p| = √129
Из ΔЕАС по теореме косинусов:
cos α = (AE² + AC² - EC²) / (2 · AE · AC)
cos α = (49 + 129 - 256) / (2 · 7 · √129) = - 78 / (14√129) = - 39√129 / 903
cos α = - 13√129/301