Jawaban:
B. 40°
Pembahasan :
sudut BCD=AEC
EBC =
180 - ABC =
180 - 60 = 120
EBC + BCD =
120 + 40 = 160
AEC =
180 - ( EBC + BCD )
180 - 160 = 20
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Jawaban:
B. 40°
Pembahasan :
sudut BCD=AEC
Jawaban:
EBC =
180 - ABC =
180 - 60 = 120
EBC + BCD =
120 + 40 = 160
AEC =
180 - ( EBC + BCD )
180 - 160 = 20