What is the area of a rectangular glass sheet if its perimeter is 14 dm and its width is 2 dm?

Find the length of a given rectangular glass sheet.
Let’s denote it by x.
According to the condition of the problem, the width of this sheet of rectangular glass is 2 dm, and the perimeter of this sheet is 14 dm, therefore, we can draw up the following equation:
2 * (x + 2) = 14.
We solve the resulting equation and find the width of the sheet:
x + 2 = 14/2;
x + 2 = 7;
x = 7 – 2;
x = 5 dm.
Find the area S of a given sheet of rectangular glass as the product of the length and width of this sheet:
S = 5 * 2 = 10 dm².
Answer: the area of this rectangular glass sheet is 10 dm².