I need help with #53 to #60 ASAP … please help this I don’t understand this …. I need to get it done before Monday that’s when it is due

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

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.

What ratio is proportional to 18/21