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30/6 = 90/x
x = 90 x 6 : 30
x = 18 cm
Untuk itu, gunakan perbandingan trigonometri:
cos 60 = 6/x
Maka:
x = 6 / cos 60
x = 6 / (1/2)
x = 6.2
x = 12 cm [C]