The table below shows the proportional relationship between the weight of oatmeal, in ounces, and the number of packs of oatmeal:

number of packs of oatmeal number of ounces of oatmeal
4 44
5 55
7 77

what is the constant of proportionality?

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.