One side of the rectangle is twice the size of the other, and their perimeter is 30 cm. What is the smaller side of the rectangle?

Given:
One side of the rectangle is 2 times larger than the other.
The perimeter of the figure is 30 centimeters.

Let the second side of the quadrangle be x centimeters.
Then the length of the first side will be 2 centimeters.
Let’s make the equation:
x + x + 2x + 2x = 30;
6x = 30;
x = 30: 6;
x = 5.
One of the sides is 5 centimeters long.
Find the length of the second side:
5 * 2 = 10 centimeters.
Answer: The smaller side of the rectangle is 5 centimeters long.