Answer:
144 ft²
Explanation:
Compare the following ratio for each of the polygons:
Area : side length
non-shaded shaded
54 : 6 = Area : 16
↓ multiply the left ratio by a number (16/6 which simplifies to 8/3) such that its right side is 16


We can identify that the values
and 144 correspond (they are equal to each other) when comparing these ratios.
Hence, the area of the shaded polygon is 144 ft².