exam Maths Puzzle Numerical Ability

An isosceles right triangle is removed from each corner of a square piece of paper so that a rectangle remains. What is the lenght of a diagonal of the rectangle if the sum of the areas of the cut-off pieces is 200?

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Three congruent rectangular banners are sewn so that each banners consists of three adjacent, congruent, vertical stripes-a middle white bordered on each side be a gray stripe. Th I am just stumped on this one problem. It is located on page 141. It is number 9. T
The given is that: line segment YW bisects line segment AX
angle a is congruent to angle X