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untuk jarak kita gunakan Cos α
t/r = Cos α
t/15 = Cos 55°
t = 15 (0,5736)
t = 8,6 m
Kedalaman air = 15 - 8,6 = 6,4 m
lebar permukaan
tali busur AB
AO =√15² - (8,6)²
= √ 225 - 73.96
= √ 151.04
= 12,3
AB = 2 x 12,3 = 24,6