Can you construct a triangle with length of 11, 17, 29?

Can someone me with this problem . show your work .

The clayton family’s pool has vertices at the coordinates (0, 2), (0, 5), (2, 5), (2, 6), (5, 6), (5, 1), (2, 1), and (2, 2). if each grid square has an area of 9 square feet, what is the area of the pool?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).