Help Calculate the perimeter please

Use set builder notation to represent the following set: { -3, -2, -1, 0}

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1