Calculate Parallelogram Perimeter: Given Sides 1 and 0.9 Units

To solve this problem, we'll follow these steps:

• Step 1: Identify the given side lengths
• Step 2: Apply the perimeter formula for a parallelogram
• Step 3: Perform the calculation

Now, let's work through each step:
Step 1: The problem gives us the side lengths of the parallelogram, $a = 1$ and $b = 0.9$.
Step 2: We'll use the formula for the perimeter of a parallelogram, $P = 2(a + b)$.
Step 3: Substituting the values, we get $P = 2(1 + 0.9) = 2 \times 1.9 = 3.8$.

Therefore, the solution to the problem is $\textbf{3.8}$.