The perimeter of a triangle is 312 cm. Find its area if one side of the rectangle is 11 times smaller than the other.

Given:
The perimeter of the rectangle is 312 centimeters.
One side of the rectangle is 11 times smaller than the other.
Let one side of this figure be x centimeters.
Then the length of the second side will be 11x centimeters.
Let’s make the equation:
x + x + 11x + 11x = 312;
24x = 312;
x = 312: 24;
x = 13.
One side is 13 centimeters long.
Let’s calculate the length of the second side of the figure:
13 * 11 = 143 centimeters.
Find the area of the rectangle:
S = 13 * 143 = 1859 m2.
Answer: the figure covers an area of 1859 m2.