In a parallelogram, the diagonals bisect each other. This means that the point where the diagonals intersect (in this case, point A) divides each diagonal into two equal segments.
Given that the length of diagonal WY is 7 centimeters, we can find the length of segment AW. Since A is the midpoint of diagonal WY, we can calculate:
\[ AW = \frac{1}{2} \times WY = \frac{1}{2} \times 7 \text{ cm} = 3.5 \text{ cm} \]
Thus, the length of AW is 3.5 cm.