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54o = 54o
b. sudut AOB = 180o - (sudut ABO + sudut BAC)
= 180o - ( 54o + 54o)
= 180o - 108o
= 72o
c. sudut OAD = 90o - sudut BAC
= 90o - 72o
= 18o
d. sudut ADO = sudut OAD
18o = 18o
e. sudut OCB = sudut ADO
18o = 18o
f. sudut OBC = sudut OAD
18o = 18o
2. a. 2 segitiga siku-siku
b. sudut KLM = 180o - (sudut MNL + sudut LMN)
= 180o - (90o + 20o)
= 180o - 110o
= 70o
sudut KMN = sudut LMN
20o = 20o
sudut KML = 2 x sudut LMN
= 2 x 20o
= 40o
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