To find the perimeter of a rectangle, add all the sides: Perimeter = 2 × (length + width).
If BD = 16.5 and CE = 4.5, and BD and CE represent the length and width, then:
Perimeter = 2 × (16.5 + 4.5) = 2 × 21 = 42.
So, the perimeter is 42 units.
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