Question

Иллюзионисту длЯ фокуса необходима прямоугольный лист бумаги.найди периметр и площадь листа если его сторана 4дм и 90см.

Answer 1

P=(a+b)*2
P=(40+90)*2
P=260 см
4дц=40см
S=40*90
S=3600см
S=36м

Answer 2

Calculation of Perimeter and Area of a Rectangular Sheet of Paper

To find the perimeter and area of a rectangular sheet of paper, we need to know the length and width of the sheet.

Given: - Length of the sheet = 4 dm - Width of the sheet = 90 cm

To calculate the perimeter of the sheet, we add up all the sides of the rectangle: Perimeter = 2 * (Length + Width)

Substituting the given values: Perimeter = 2 * (4 dm + 90 cm)

To perform the calculation, we need to convert the units to a common unit. Let's convert the length to centimeters: 1 dm = 10 cm

Converting the length: Length = 4 dm * 10 cm/dm = 40 cm

Now we can calculate the perimeter: Perimeter = 2 * (40 cm + 90 cm) = 2 * 130 cm = 260 cm

Therefore, the perimeter of the rectangular sheet of paper is 260 cm.

To calculate the area of the sheet, we multiply the length by the width: Area = Length * Width

Substituting the given values: Area = 4 dm * 90 cm

Again, we need to convert the length to centimeters: Length = 4 dm * 10 cm/dm = 40 cm

Now we can calculate the area: Area = 40 cm * 90 cm = 3600 cm²

Therefore, the area of the rectangular sheet of paper is 3600 cm².

Summary: - Perimeter of the sheet = 260 cm - Area of the sheet = 3600 cm²

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