percuma ngirim begini gada yg bantuin sesusah itu ya sekarang bantuin orng “) nanti yg batuin aku ku kasih like follow jawaban tercerdas dll
1) a. X= 180°- (60°+ 80°)
= 40°
b. X= 180° – (25°+30°)
= 125°
2) a = 180° – 60°
= 120°
b = 180° – 40°
= 140°
c = 180° – 80°
= 100°