6th Grade Math Problem Please Help Me Solve.

(Also Explain Please)

THANK YOU SO MUCH!

ALSO WORTH POINTS!

=)

What is the perimeter of a rectangle if the length is 5 and the width is x?

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 is the benefit of converting measures in a ratio to the same unit