In an orchestra the ratio of trombones to violas is 1 to 3.
a.) there are 9 violas. write a proportion that gives the number t of trombones in the orchestra. b.)how many trombones are in the orchestra?
, i'm in 8th grade! (: youu..

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.