The coordinate notation shows how the coordinates of a figure are related to the coordinates of its image after transformations.
what are the transformations?
(x, y) → ( - x - 1,y - 2)

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square

The answer is d angle 4