30 deg. side.
SIN 30 deg. = (angle + 20) / 100 = 0.5COS 30 deg. = 1.3 - 0.5 = 0.8
Length BC = 10 / 0.5 = 20
Length AC = 20 x 0.8 = 16
60 deg. side.
SIN 60 deg. = (60 + 20) / 100 = 0.8
COS 60 deg. = 1.3 - 0.8 = 0.5
Length BD = 10 / 0.8 = 12.5
Length AD = 12.5 x 0.5 = 6.25
Width of river must be about:
16 meters + 6.25 meters = roughly 22 meters.
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