Вопрос школьника по предмету Математика
Ширина прямоугольника 4,7метра,а длина в 2,8 больше.Найдите периметр и площадь.
Ответ учителя по предмету Математика
Формула периметра: (a+b)*2
Формула площади: a*b
1) 4,7*2,8=13,16 (м) — длина,
2) (13,16+1,7)*2=14,86*2=29,72 (м) — периметр,
3) 13,16*4,7=22,372 (м в квадрате) — площадь.
Ответ: 29,72 м; 22,372 м в квадрате.
Похожие вопросы от пользователей
Come and spend a day in an English school! It is nearly 9 on Monday morning, and the boys and girls are going to school again, after having had Saturday and Sunday free. Some of them walk to school, some come on their bicycles, and others who live further away from the school, come by bus. There goes the bell. The pupils are marched to the classrooms for the first lesson.
11 o’clock is mid-morning break when most of the younger children have a drink of milk. The boys and girls go out into the playground where they can play until it is time to go back inside for lessons. The boys play football, and the girls play with a ball, or a skipping rope. But the older boys and girls just stand, talk and watch the games. Then the bell goes. It is time for lessons again and they all hurry inside.
There are lessons till I o’clock, when it is time for lunch. The boys and girls queue up to get their lunch from the cooks. Nearly all schoolchildren in England have their lunch at school, though some, who live very near to their school, go home.
The break for lunch lasts about an hour. After lunch, there is still time to go out and play. In summer everyone wants to go outside in the sun, but in winter, when it is cold, everyone tries to hide in the cloak room. The older boys and girls, who act as prefects, make the others go outside to get some fresh air. It is not good for children to be indoors all day. But when it is raining, of course, the prefects let the boys and girls go into the classroom and read, or play quietly. Mar children do their homework,. so that they will be free in the evening to go out with their friends, or to watch television.
At 2 o’clock lessons start again. In this school the children not only do lessons like history, geography and maths: the girls learn to type and sew, and to cook, and the boys do metalwork and woodwork. Some schools also allow girls to do metalwork if they want to (they make jewellery for themselves) and teach cookery to boys. It is very useful to be able to cook for yourself, if your mother is away!
At 3 o’clock it is time for games. In English schools, the girls usually play grass hockey in winter and tennis and various team games in summer, the boys play football in winter and cricket in summer.
Lessons are over at 4. The children collect the books they need to do their homework, hurry to the cloakroom, to fetch their hats and coats, and go home. Very soon after 4 o’clock, the school is empty, except for a few children and teachers. One or two children have to stay behind as a punishment for bad behavior. Others are staying for a club which has its meeting after school. Then they will go home too, and the school will be empty — until tomorrow! 1) far away from school—— 2)get milk——- 3) a pudding of different sort————