When you find the perimeter, the units you pick are really important!

• Same Unit: If you use the same unit for everything (like all in meters), it’s easy. Just add them up! For example, $P = a + b + c + d$.

• Different Units: If the lengths are in different units (like some in meters and others in centimeters), you have to change them to the same unit first.

Being consistent is key! If you don’t, you might get the wrong total!