Question

Mathew finds the deepest part of the pond to be 185 meters

Answer 1

$\sqrt{196} = 14$, and since $\sqrt{185$ is less than $\sqrt{196}$, the deepest part of the pond is less than 14.

-> The depth of the pond is between 13 and 14 meters.

Or, you can just calculate $\sqrt{185}$ = 13.6014... (between 13 and 14)