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On solving the right triangle problem in mathematics (senior high school)
B bar

According to the principle of large angle to large side, we can know that angle C is the smallest angle.

So according to COSC = (A 2+B 2-C 2)/2AB, COSC = (48+49-13)/(2x7x4 √ 3) = √ 3/2.

So the angle c is π/6, so choose B.