Question

Периметр прямоугольника 120см. длинна прямоугольника на 10 см больше. найди площадь прямоугольника. не уравнением без (х) как сделать???

Answer 1

Р = (А + В ) х2

1) 120 - 10 х 2 = 100(см) периметр прямоугольника при равных сторонах
2) 100: 4 = 25(см) ширина прямоугольника
4) 25 + 10 = 35(см) длина прямоугольника

S = A x B
25 х 35 = 875(см²)
    

Answer 2

Точно не уверенна ,но думаю так)

Answer 3

Finding the Area of a Rectangle

To find the area of a rectangle when the perimeter and length of the rectangle are given, we can use the following steps:

1. Calculate the Width of the Rectangle: - The perimeter of a rectangle (P) is given by the formula: P = 2 * (length + width). - Given that the perimeter of the rectangle is 120 cm, and the length is 10 cm more than the width, we can calculate the width using the perimeter formula.

2. Find the Area of the Rectangle: - Once we have the length and width of the rectangle, we can calculate the area (A) using the formula: A = length * width.

Calculation Steps

1. Calculate the Width of the Rectangle: - Using the perimeter formula, we can calculate the width of the rectangle: - P = 2 * (length + width) - 120 = 2 * (length + width) - We know that the length is 10 cm more than the width, so we can express the length in terms of the width: length = width + 10. - Substituting the length in the perimeter formula: 120 = 2 * ((width + 10) + width) - Simplifying the equation: 120 = 2 * (2 * width + 10) - Solving for the width: width = 120 / 4 - 5 - Therefore, the width of the rectangle is 25 cm.

2. Find the Area of the Rectangle: - Now that we have the width, we can calculate the area of the rectangle: - A = length * width - Given that the length is 10 cm more than the width, the length is 25 + 10 = 35 cm. - Calculating the area: A = 35 * 25 - Therefore, the area of the rectangle is 875 square centimeters.

So, the area of the rectangle is 875 square centimeters.