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2. 120/ 180 = 2/3
4. 16/ 20 = 4/5 A
2. 120° . π/180= 2/3 π (C)
3. AB = 8 cm , BC = 12 cm , siku di B
AC =√ 8^2 + 12^2
= √64+144
= √208 = 4√13 cm
(D)
4. AC = √16^2 + 12^2
=√256+144
=√400 = 20 cm
cos = samping / miring
(A)
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