单项选择题

If a and b are the lengths of the legs of a right tri-angle whose hypotenuse is 10 and whose area is 20, what is the value of (a+b)²（）

A. 100
B. 120
C. 140
D. 180
E. 200

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单项选择题

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If a and b are the lengths of the legs of a right tri-angle whose hypotenuse is 10 and whose area is 20, what is the value of (a+b)2（）