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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
A． 100
B． 120
C． 140
D． 180
E． 200
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In the tradition of scholarly （）...
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