Answer:
Part 1) The length of each side of the square is about 4.47 units
Part 2) The length of its diagonal is about 6.32 units
Explanation:
Part 1)
Find the length of each side of the square
In the right triangle TPQ
Applying the Pythagoras Theorem

substitute the given values



-----> exact value
-----> approximate value
Part 2)
Find the length of the diagonal of the square
Applying the Pythagoras Theorem

we have


substitute


-----> exact value
----> approximate value