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dit.
a. sudut ABC, b. sudut AOC kecil. d.sudut ADC
jawab.
a. <ABC= 1/2 × <AOC= 1/2× 120°= 60°
b. <AOC besar + <AOC kecil= 360°
jadi <AOC besar = 360° - <AOC kecil
= 360° - 120° = 240°
c. <ABC + <ADC = 180°
60°. + < ADC=180°
<ADC= 180° - 60° = 120°