120°
< abd = 180° - ( 180° ½ )
= 180° - 60°
= 120°
jadi besar < abd adalah 120° opsi ( D )
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120°
penyelesaian soal :
< abd = 180° - ( 180° ½ )
= 180° - 60°
= 120°
jadi besar < abd adalah 120° opsi ( D )