Millimeters, inches, light-years, miles, it's all the same: Measure all four sides and add their lengths together. That's what "perimeter" means.
For some figures there really is a formula. For example, since a square or a rhombus has all four sides the same length, you can just measure one of them and multiply by 4. But the sides of a trapezoid (not "TARPezoid") don't have any particular relationship in terms of length.
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The perimeter is 60 mm
2(length + height)= perimeter
Square is a special case of a rectangle and the same formula may be used to find the perimeter
Perimeter = sum of the lengths of the sides.
The perimeter of a pentagon is the sum of its 5 sides