Question

Найти сторону прямоугольника если его периметр равен 40 см а длина 12 см.Узнай площадь этого прямоугольника

Answer 1

P = 2a + 2b
P = 2*12 + 2b = 24 + 2b = 40
2b = 16
b = 8
S = 8 * 12 = 96

Answer 2

Finding the Side Length of a Rectangle

To find the side length of a rectangle when its perimeter is given, we can use the formula:

Perimeter = 2 * (Length + Width)

In this case, the perimeter is given as 40 cm and the length is given as 12 cm. Let's substitute these values into the formula and solve for the width:

40 cm = 2 * (12 cm + Width)

To find the width, we need to isolate it on one side of the equation. We can start by dividing both sides of the equation by 2:

40 cm / 2 = (12 cm + Width)

Simplifying further:

20 cm = 12 cm + Width

Now, we can subtract 12 cm from both sides of the equation:

20 cm - 12 cm = Width

8 cm = Width

Therefore, the width of the rectangle is 8 cm.

Calculating the Area of the Rectangle

To calculate the area of a rectangle, we can use the formula:

Area = Length * Width

In this case, the length is given as 12 cm and the width is 8 cm. Let's substitute these values into the formula:

Area = 12 cm * 8 cm

Simplifying the multiplication:

Area = 96 cm^2

Therefore, the area of the rectangle is 96 square centimeters.