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答案：
B
Geometry Triangles; Area; Pythagorean Theorem
1. Given that the hypotenuse of the triangle is
, it follows that x2 + y2 = 
= 200. It is possible that x = y = 10 (x 2 + y 2 = 200), in which case xy = 100. However, it is also possible that x = 
and y = 
, in which case xy =
; NOT sufficient.
2. Given that the area of the triangle is 50, it follows that
= 50, so xy = 100; SUFFICIENT.
The correct answer is B; statement 2 alone is sufficient.
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