Question

Sailor Sheftal

Answer 1

Answer: $9\sqrt{2}$

Step-by-step explanation:

• The sides of a square are all equal in length.

Use the Pythagorean Theorem:

$9^{2} +9^{2} =x^{2}\\x=\sqrt{9^{2} +9^{2}} =\sqrt{2(9)^{2} } =9\sqrt{2}$