To calculate the perimeter of a rectangle, you can use the formula:
\[ \text{Perimeter} = 2 \times (\text{length} + \text{width}) \]
For the doormat, the length is 36 inches and the width is 21 inches. Plugging in these values:
\[ \text{Perimeter} = 2 \times (36 \text{ inches} + 21 \text{ inches}) = 2 \times 57 \text{ inches} = 114 \text{ inches} \]
Therefore, the perimeter of the doormat is 114 inches.
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