Help me please I need the answer

Use set buikder notation to represent the following set: {, -2, -1, 0}

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

Could somebody me with this radical simplification?