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Misalkan
a=m sudut A
b=m sudut B
a-b=70°
a=3b
a).
a-b=70
(3b)-b=70
2b=70
b=70/2
b=35°
a=3b=3×35=105°
mLA+mLB=105°+35°=140°
b) Pelurus sudut A=180-105=75°