Perimeter is the sum of the sides of a
two-dimensional shape. To calculate the perimeter of rectangle, you have to sum
the 4 sides. The formula is P = 2L + 2W. Replacing the formula with the given -
P = 2(5) + 2(10);
= 10 + 20
= 30
Therefore, the perimeter of the rectangular piece of plastic is 30 millimeters
