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dalam bersebrangan= A1 B2, A2 B1
luar berseberangan= A2 B4, A1 B3
dalam sepihak= A2 A3, A1 A4, B1 B4, B2 B3
luar sepihak= A1 B4, A2 B3
1. 3x+20+5x-10= 180
8x+10= 180
8x= 180-10
8x= 170
x= 21,25°
sudut A= 5x21,25-10= 106,25-10= 96,25°
2. 180-150= 30°
6a+30+30= 180
6a+60= 180
6a= 180-60
6a= 120
a= 120:6
a= 20°
3. A= 102°
4. A= 180°-20°= 160°
maaf kalau ada angka yg salah, semoga bermanfaat:)