George, who is -6.25 feet tall, needs to know the height of a tree that he is going to cut down. He notices that he casts a 10 foot shadow when the tree casts a 28 foot shadow. The height of the tree is how tall.

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.