A square prism has sides of length 3cm, 3cm and 14cm as shown.

If the size of \angle DFH is \theta °, find theta to two decimal places.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: A square prism has sides of length 3cm, 3cm and 14cm as shown.

If the size of \angle DFH is \theta °, find theta to two decimal places.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: A square prism has sides of length 3cm, 3cm and 14cm as shown.

If the size of \angle DFH is \theta °, find theta to two decimal places.