Если противоположные стороны четырехугольника попарно параллельны, то этот четырехугольник — параллелограмм.Если в четырехугольнике противоположные стороны попарно равны, то этот четырехугольник — параллелограмм.Если в четырехугольнике две противоположные стороны равны и параллельны, то этот четырехугольник — параллелограмм.Если в четырехугольнике диагонали, пересекаясь, точкой пересечения делятся пополам, то этот четырехугольник — параллелограмм.Середины сторон произвольного (в том числе невыпуклого или пространственного) четырехугольника являются вершинами параллелограмма Вариньона.Стороны этого параллелограмма параллельны соответствующим диагоналям четырехугольника . Периметр параллелограмма Вариньона равен сумме длин диагоналей исходного четырехугольника, а площадь параллелограмма Вариньона равна половине площади исходного четырехугольника.
I would like to describe to you my working day. All these days are similar to each other.
On weekdays I usually get up at seven. I do gymnastics. Then I wash my face and hands and brush their teeth. At half past seven I'm ready to Breakfast. I love to have a quick light Breakfast. After Breakfast I go to school.
My school near my house. The road to the school is 10 minutes. My lessons begin at 8:30 and ends at 15:00. Six or seven lessons a day with daily routine. Twice a week I stay at school after classes to play basketball.
When I come home I have dinner. Then I rested a little. Sometimes I read a book or talk with my friends on the phone.
After that I start my homework. Twice a week I attend private lessons in mathematics in order to improve my knowledge.
Usually I finish complete their homework about 11 hours. But one day a week is not as loaded. This Thursday. On Thursday I usually help my mother. Sometimes I make a purchase or take clothes from the dry cleaners.
I usually dine in 8 hours. Then I will continue to work. At 11 o'clock I go to sleep.
On weekdays I usually get up at seven. I do gymnastics. Then I wash my face and hands and brush their teeth. At half past seven I'm ready to Breakfast. I love to have a quick light Breakfast. After Breakfast I go to school.
My school near my house. The road to the school is 10 minutes. My lessons begin at 8:30 and ends at 15:00. Six or seven lessons a day with daily routine. Twice a week I stay at school after classes to play basketball.
When I come home I have dinner. Then I rested a little. Sometimes I read a book or talk with my friends on the phone.
After that I start my homework. Twice a week I attend private lessons in mathematics in order to improve my knowledge.
Usually I finish complete their homework about 11 hours. But one day a week is not as loaded. This Thursday. On Thursday I usually help my mother. Sometimes I make a purchase or take clothes from the dry cleaners.
I usually dine in 8 hours. Then I will continue to work. At 11 o'clock I go to sleep.