Question

Найти тремя способами периметр прямоугольника ,одно сторона которого равна 5 дм, а другая на 4 дм длиннее

Answer 1

Р=2×(а+б)
1 способ
5+4=9 (см) - другая сторона
2×(5+9)=28 (см) - периметр
2 способ
5×2+(5+4)×2=28 (см)
3 способ
2×(5+5+4)=28 (см)

Answer 2

Three ways to find the perimeter of a rectangle

To find the perimeter of a rectangle, you can use the following three methods:

Method 1: Using the formula P = 2(a + b)

The perimeter of a rectangle can be calculated by adding the lengths of all four sides. For a rectangle with sides of length 'a' and 'b', the formula for the perimeter is P = 2(a + b).

In this case, one side of the rectangle is given as 5 dm, and the other side is 4 dm longer. Let's denote the longer side as 'b'. Therefore, 'a' would be 5 dm, and 'b' would be 5 dm + 4 dm = 9 dm.

Using the formula, we can calculate the perimeter as follows: P = 2(5 dm + 9 dm) = 2(14 dm) = 28 dm.

Therefore, the perimeter of the rectangle is 28 dm.

Method 2: Adding all four sides

Another way to find the perimeter of a rectangle is by adding the lengths of all four sides.

In this case, the rectangle has two sides of length 5 dm and two sides of length 9 dm. Adding all four sides, we get: Perimeter = 5 dm + 5 dm + 9 dm + 9 dm = 28 dm.

Therefore, the perimeter of the rectangle is 28 dm.

Method 3: Using the sum of opposite sides

A third method to find the perimeter of a rectangle is by using the sum of opposite sides.

In this case, the opposite sides of the rectangle are 5 dm and 9 dm. Adding these two sides, we get: Perimeter = 5 dm + 9 dm = 14 dm.

Since the opposite sides of a rectangle are equal in length, we can multiply this sum by 2 to get the perimeter: Perimeter = 2 * 14 dm = 28 dm.

Therefore, the perimeter of the rectangle is 28 dm.

In conclusion, all three methods yield the same result: the perimeter of the rectangle is 28 dm.