PLEASE HELP . .

2√2

Step-by-step explanation:

since this is a right triangle and the two legs are congruent, b must also equal 2

then using pythagorean theorem (a^2 + b^2 = c^2), we can find that a = 2√2

I hope this helped, and if my answer was right, please mark this answer as brainliest! Thank you!

stops on an even number.