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dan besar sudut total suatu segitiga = 180°
a) 3x°+x° = 180° --> terletak pada sebuah garis lurus
4x° = 180°
x =
x = 45° --> besar sudut x
b) <SPR = 3x° = 3 (45) = 135° --> masukkan x° nya
c) <PRQ =?
80+x+<PRQ = 180
80+45+<PRQ = 180
125 <PRQ = 180
<PRQ = 180-125
<PRQ = 55°