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A  = 30.5°

c  =  52.8

Angle C  =  90 - 30. 5   =  59.5°

Using the Law of Sines

a / sin A  =  c / sin C

a / sin 30.5 =    52.8 / sin 59.5          multiply both sides by sin 30.5

a =  52.8*sin 30.5  / sin 59.5    =  31.1 ft