There is a square with sides of 13

There is a square with sides of 13. What is the area of the biggest circle that can be cut out of this square?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #2928