Question

Длина прямоугольника равна 3 дм а ширина на 2 см меньше Найди площадь и периметр​

Answer 1

Ответ:

1 дм = 10 см

3 дм = 30 см

30 -2 = 28 см - щирина прямоугольника

Площадь прямоугольника равна произведению его сторон (a, b):

S = a * b

S = 28 *30 =  840 см 2

Периметр прямоугольника равен удвоенной сумме 2-х его сторон  

Р = 2 ( а + в)

Р =  2 ( 30 +28 ) = 2 *  58 =  116 см

Пошаговое объяснение: вот 100% правильно =)

Answer 2

Calculation of Area and Perimeter of a Rectangle

To find the area and perimeter of a rectangle, we need to know the length and width of the rectangle. In this case, the length of the rectangle is given as 3 dm (decimeters), and the width is 2 cm (centimeters) less than the length.

Let's calculate the area and perimeter of the rectangle.

Calculation:

1. Length of the Rectangle: The length of the rectangle is given as 3 dm.

2. Width of the Rectangle: The width of the rectangle is 2 cm less than the length. Since 1 dm is equal to 10 cm, we can convert the length from dm to cm and subtract 2 cm to find the width. - 3 dm = 3 * 10 cm = 30 cm - Width = 30 cm - 2 cm = 28 cm

3. Area of the Rectangle: The area of a rectangle is calculated by multiplying its length and width. - Area = Length * Width = 3 dm * 28 cm = 84 dm * cm^2

4. Perimeter of the Rectangle: The perimeter of a rectangle is calculated by adding all its sides. - Perimeter = 2 * (Length + Width) = 2 * (3 dm + 28 cm) = 2 * (3 dm + 280 cm) = 2 * (3 * 10 cm + 280 cm) = 2 * (30 cm + 280 cm) = 2 * 310 cm = 620 cm

Answer:

Therefore, the area of the rectangle is 84 dm * cm^2 and the perimeter of the rectangle is 620 cm.

Please let me know if there is anything else I can help you with!