Dengan konsep sifat-sifat sudut, diperoleh :
42 + 3r + 15 = 180°
3r + 57 = 180°
3(r + 19) = 180°
r + 19 = 60
r = 41°
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Dengan konsep sifat-sifat sudut, diperoleh :
42 + 3r + 15 = 180°
3r + 57 = 180°
3(r + 19) = 180°
r + 19 = 60
r = 41°
r= 180°-(42°+15°)
r = 123° : 3
r = 41°
jawabannya adalah(B)