Perimeters of polygons with missing side lengths

Calculating the perimeter of a polygon with missing side lengths involves determining the total distance around the shape by adding the lengths of all its sides. If some side lengths are unknown, they might be represented by variables or expressions. To find the perimeter, you can:

1. Identify Known Lengths: Gather all provided side lengths.
2. Use Variables for Unknowns: Assign variables (like $x$, $y$, etc.) to any missing lengths.
3. Formulate Equations: If additional information is given (like relationships between sides), create equations to express the unknowns.
4. Sum Up: Add all known lengths and substitute values for any variables to compute the total perimeter.

This process requires understanding the properties of polygons and basic algebra to solve for missing values.