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Ijinkan saya menjawab

No. C :
cos 30 = x / 16
1/2√3 = x / 16
2x = 16√3
x = 16√3 / 2
x = 8√3 cm

No. D :
cos 30 = 16√2 / x
1/2√3 = 16√2 / x
√3x = 32√2
x = 32√2 / √3
x = 32√6 / 3
x = 32/3√6 cm