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180°=6× +12
168°=6×
×=28
.
2×=2(28)=56
×+10=(28)+10=38
3×+2=3(28)+2=84+2=86
6x+12 = 180
6x = 180-12
6x = 168
x = 168 ÷ 28
x = 28.......a
besar sudut..........b
2x = 2(28) = 56°
x+10 = (28)+10 = 38°
3x+2 = 3(28)+2 = 84+2 = 86°
[¹] kenapa 180? karena segitiga mau apapun modelnya, jumlah total sudutnya pasti selalu 180°
test: 56+38+86 = 180