Точки р и т серединны ребер ab и bd тетраэдра abcd. есть ли среди векторов а b c пара коллинеарных #2

ответ:

вектора а и b - коллинеарны.

объяснение:

отрезок рт - средняя линия треугольника abd по определению, так как точки р и т - середины сторон ав и ad. следовательно, отрезок рт параллелен отрезку ad, то есть вектора а и b коллинеарны (параллельны), так как лежат на параллельных прямых.

Abdilda Tazhibayev was born in 1909 in Akmeshit (now Kyzylorda). Medium

one hundred

The Kipchak tribe Tory clan is descended from Bessary's grandfather. [1] [2] His father, Tazhibai, died in 1915 and was left in the care of his mother, Aimankul. Due to his condition, six-year-old Abdilda was taken to a suburb of Karaozek. Then the future poet lived until the age of thirteen with his mother Aimankul and uncle Daldabay

grows in upbringing. Young Abdilda's poems and literature

His mother and aunt also aroused his curiosity

will be the grandfather. Aimankul is fluent in Arabic and Persian

He was literate, open-minded, and cheerful.

He writes letters to Abdilda and teaches her literature. Abdilda's mother Aimankul, who later became a well-known folk poet and published a collection of poems, at the request of his father Daldabay, recited to the villagers the stories of the East and various Kazakh poems. Passionate, silent, silent

One of his listeners was Abdil. Later, in a small group, Abdilda would recite the stories and epics to his guests and villagers.

24см²

Объяснение:

△ABD - равнобедренный т.к. AB = BD по условию,

Пусть BH - высота, она проведена к основанию,

Высота равнобедренного треугольника, проведённая к его основанию является так же и медианой.

⇒ BH - медиана;

AH = HD т.к. H - основание медианы;

AH = AD:2 = 6см:2 = 3см.

△AHB - прямоугольный т.к. ∠AHB = 90°,

Квадрат гипотенузы равен сумме квадратов катетов (т. Пифагора).

AB² = AH²+BH²;

BH² = AB²-AH²;

BH² = 5²-3²;

BH² = 25-9 = 16 = 4²;

BH = 4 см.

Площадь параллелограмма равна произведению его высоты на сторону, к которой она проведена.

BH - высота параллелограмма ABCD, проведённая к стороне AD;

S = BH·AD;

S = 4см·6см = 24см².