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Sudut 3a° dengan a° saling berpelurus (suplemen) maka
3a° + a° = 180°
4a° = 180°
a° = 180/4
a ° = 45°
5b
3 sudut b° saling berpelurus (suplemen) maka
3b° = 180°
b° = 180/3
b° = 60°
3a°+a°=180°
4a°=180°
a°=180°/4
=45°
5B.
3b°=180°
b°=180/3
=60°