Please help and show work ​

Step-by-step explanation:

sides opposite to equal angles are equal in length :

angle45 = angle 45

r = s

by Pythagoras theorem :

r² + s² = (9√2 )²

s²+s²= 9 × 9 × 2

2s²= 9× 9×2

s²= 9 × 9

s= √9× 9

s = 9

r= s = 9 units .

plz mark my answer as brainlist pl hope this will be helpful to you.

the correct answer is 45x

9×5=45 then add the x

i believe it's a.

i'm not sure on this one, most likely correct.