Complete the process of solving the equation. Fill in the missing term on each line. Simplify any fractions.
2b + 13 - 9 = 12
2b +
= 12 (Combine like terms)
2b =
(Subtract 4 from both sides)
b =
(Divide both sides by 2)

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.