Question

Найди периметр и площадь прямоугольника если его ширина 250 мм а длина на 3 см больше Вырази площадь в квадратных дециметрах

Answer 1

250 мм = 25 см
25+3= 28 см
Р=2*(a+b)
P=2 *(25+28)
P=106 см
S=a*b
S=25*28
S=700 см²=7 дм²
1 мм=0,1см, 1см =0,1 дм,1дм=10см,1см=10мм

Answer 2

Для начала преобразуем 250мм= 25см
25+3=28см- длина прям-ка
(25+28)х2=106 см-это периметр
Р=(а+в)х2,
25*28= 700 кв см= 7 кв дм

Answer 3

Calculating the Perimeter and Area of a Rectangle

To find the perimeter and area of a rectangle, we can use the following formulas:

Perimeter of a Rectangle: The perimeter (P) of a rectangle is given by the formula: P = 2 * (length + width)

Area of a Rectangle: The area (A) of a rectangle is given by the formula: A = length * width

Given: - Width = 250 mm - Length = 3 cm more than the width

Calculating the Length

To calculate the length, we need to convert the width to the same unit as the length. Since 1 cm = 10 mm, the width is 250 mm and the length is 250 mm + 3 cm * 10 mm/cm.

Calculating the Perimeter

Using the formula for the perimeter of a rectangle: P = 2 * (length + width)

Calculating the Area

Using the formula for the area of a rectangle: A = length * width

Converting Area to Square Decimeters

To express the area in square decimeters, we need to convert the area from square millimeters to square decimeters. Since 1 square decimeter = 100 square millimeters, we can divide the area in square millimeters by 100 to get the area in square decimeters.

Let's calculate the length, perimeter, area, and express the area in square decimeters.