One side of the rectangle is 3dm 8cm and its perimeter is 26dm. Find the other side of the rectangle.

Given: rectangle, one side a = 3 dm 8 cm, perimeter P = 26 dm
Find the second side of the rectangle – b
Decision
Since there are 10 centimeters in decimeters, the side a = 3dm 8 cm = 38 cm, and the perimeter P = 26 dm = 260 cm
1.The perimeter of the ramen rectangle is P = (a + b) * 2, where a and b are the sides of the rectangle
2.we substitute 260 = (38 + b) * 2
130 = 38 + b
b = 130 – 38 = 92 cm or 9 dm 2 cm
Answer: 9 dm 2 cm