Question

Как найти пириметр по математике 3 класса

Answer 1

Р - (т.е. периметр) находится смотря где он находится
1.  ПРЯМОУГОЛЬНИК ( к примеру у тебя прямоугольник, длинна 6 см, ширина 8см, тебе нужно сделать так:)
6+6+8+8=56см
2. КВАДРАТ (как известно, у квадрата все стороны равны, поэтому. к примеру длинна\высота\ширина 10см, тебе нужно сделать так:)
10*4 ЛИБО 10+10+10+10 = 40см
Надеюсь понятно объяснила,
Удачи!

Answer 2

Calculating perimeter in 3rd grade mathematics

To calculate the perimeter of two-dimensional shapes in 3rd grade mathematics, there are a few key steps:

1. Identify the shape. The most common shapes where perimeter is calculated at this level are rectangles and squares.

2. Identify the length of each side. For rectangles, you need the length and width. For squares, you only need the length of one side since all sides are equal.

3. Use the perimeter formula. For rectangles, the perimeter formula is: `P = 2(length + width)`. For squares, it is: `P = 4 * side length`.

4. Plug the side lengths into the formula and calculate. For example, if you have a rectangle with length 9 units and width 11 units:

`P = 2(length + width) P = 2(9 + 11) P = 2(20) P = 40`

5. Write the final answer with correct units (usually cm or m). In this example, the final answer would be "40 cm".

6. Check your work. Re-calculate to ensure you have the right solution. Teachers may also provide example problems to practice.

The key things to remember are identifying the shape, finding all relevant side lengths, selecting the correct perimeter formula, plugging into the formula accurately, and writing the final answer with units. Let me know if you have any other specific perimeter calculation examples you need help with.