I can't see the picture, can you please explain the problem in the comment bar below this so can edit my answer to help?
Answer:
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This an isosceles right triangle. The sides opposed to the angle 45° are congruent. Let x be this side==> x²+x² =(7√2)² (Pythagoras)
2x² = 49(2) ==> 2x²= 98 ==> x²=49 & x=7
