Question

Ширина прямоугольника составляет 20% его периметра, а длина равна 1,5 см. Найдие площадь прямоугольника.

Answer 1

х-щирина прямоугольника

100*х/20=5х - периметр

2х+2*1,5 - периметр

уравнение: 2х+3=5х

3х=3

х=1

Площадь: 1,5*1=1,5

 

Answer 2

1) (х- 2*1,5 ):2=0,2х 

(х-3):2=0.2х
Домножим на 2 
х - 3 = 0,4х 
0,6х = 3 

х=3:0.6
х =5

2)0.2*5=1см-ширина.

3)1*1.5=1.5кв.см-площадь прямоугольника.

Answer 3

Calculation of the Rectangle's Area

To find the area of a rectangle, we need to know its length and width. In this case, we are given that the width of the rectangle is 20% of its perimeter, and the length is 1.5 cm.

Let's calculate the area of the rectangle step by step:

1. Find the perimeter of the rectangle: - The perimeter of a rectangle is given by the formula: P = 2 * (length + width). - Since we know the length is 1.5 cm, we need to find the width. - According to the given information, the width is 20% of the perimeter. - Let's assume the width is represented by the variable 'w'. - Therefore, the width can be expressed as: w = 0.2 * P. - Substituting the values into the perimeter formula, we get: P = 2 * (1.5 + 0.2 * P).

2. Solve the equation for the perimeter: - Distributing the 2 on the right side of the equation, we get: P = 3 + 0.4 * P. - Subtracting 0.4 * P from both sides, we have: 0.6 * P = 3. - Dividing both sides by 0.6, we find: P = 5 cm.

3. Calculate the width: - Using the width formula, we substitute the value of the perimeter: w = 0.2 * 5. - Simplifying, we find: w = 1 cm.

4. Calculate the area: - The area of a rectangle is given by the formula: A = length * width. - Substituting the values, we get: A = 1.5 cm * 1 cm. - Calculating, we find: A = 1.5 cm².

Therefore, the area of the rectangle is 1.5 cm².

Please note that the calculations are based on the given information and assumptions made during the process.