Во-первых, только равнобочную трапецию можно вписать в окружность, это значит, что боковые стороны трапеции равны, и углы при основании равны. 1) пусть дана трапеция abcd. пусть меньшее основание = а, большее основание = b. тогда (a+b)/2 = 6 см. 2) проведем диагональ bd и опустим высоты bh и ct. т.к. трапеция равнобочная, то ah = (b-a)/2, тогда dh = b - ( (b-a)/2 ) = (2b - b + a)/2 = (b+a)/2 = 6 см. 3) рассмотрим прямоугольный треуг-к hdb. tg(60 градусов) = bh/dh, bh = tg(60 гр)*dh = sqrt(3)*6 см, т.е. нашли высоту.
І love Holiday fairs because i can buy many interesting things cheap. Autumn festival is very ineresting day , you can dance or sing with people . Concers on holiday days I love hanging out with my friends. Competitions in running always boring. Singing folk songs or chastuhras always forces me think about past people. Perfomances of the city folk always interesting because you can sea people with different talents. If me asked what is the best kind of dance , I will answer folk dance. On pet shows you can sea very beatiful pets. On flower shows you can sea flowers about what you never know
Autumn festival is very ineresting day , you can dance or sing with people .
Concers on holiday days I love hanging out with my friends.
Competitions in running always boring.
Singing folk songs or chastuhras always forces me think about past people.
Perfomances of the city folk always interesting because you can sea people with different talents.
If me asked what is the best kind of dance , I will answer folk dance.
On pet shows you can sea very beatiful pets.
On flower shows you can sea flowers about what you never know