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Review: The Diagonal of a Square
Explanation
The diagonal of a square is the hypotenuse of a 45-45-90
triangle whose two equal sides are sides of the square. Meanwhile, the area of
this square is 
,
so a side of the square is 
.
Hence, the equal sides of the triangle in question are each .
The sides of a 45-45-90 are in the ratio 
,
so in this case we can say 
and therefore 
.
Finally, 
.
The correct answer is (B).
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