Calculate Parallelogram Perimeter: Finding the Total Length with Sides 4 and 5

Given the parallelogram:

Calculate the perimeter of the parallelogram.

To solve the problem of calculating the perimeter of the parallelogram, follow these steps:

• Identify the given side lengths: $AB = 5$ and $AC = 4$.
• Acknowledge that in a parallelogram, opposite sides are equal, so $AB = CD = 5$ and $AC = BD = 4$.
• Apply the perimeter formula for a parallelogram: $P = 2 \times ( \text{Base} + \text{Side} )$.

Plug the known side lengths into the formula:
$P = 2 \times (AB + AC) = 2 \times (5 + 4) = 2 \times 9 = 18$

Thus, the perimeter of the parallelogram is $18$.