To find the width of the rectangle, we can use the formula for the perimeter of a rectangle, which is given by:
\[ P = 2 \times (L + W) \]
where \( P \) is the perimeter, \( L \) is the length, and \( W \) is the width.
Given that the perimeter \( P = 22.4 \) cm and the length \( L = 8.3 \) cm, we can substitute these values into the perimeter formula:
\[ 22.4 = 2 \times (8.3 + W) \]
Next, we will simplify the equation. Start by dividing both sides by 2:
\[ 11.2 = 8.3 + W \]
Now, subtract \( 8.3 \) from both sides to solve for \( W \):
\[ W = 11.2 - 8.3 \]
Calculating the right side:
\[ W = 2.9 \]
Thus, the width of the rectangle is \( \boxed{2.9} \) cm.
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