9514 1404 393
Answer:
13.0 inches
Explanation:
The diagonal of a square is √2 times the side length, so the diagonal stripe has length ...
(9.2 in)√2 ≈ 13.0 in
The white stripe is 13.0 inches long.
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The diagonal is the hypotenuse of an isosceles right triangle. The side lengths of such a triangle have the ratios ...
1 : 1 : √2
That is, the longest side (hypotenuse) is √2 times either of the equal-length shorter sides.
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If you prefer to use the Pythagorean theorem, you can compute the diagonal from ...
d² = 9.2² + 9.2²
d = √(2×9.2²) = 9.2√2 ≈ 13.0