2x + x + 20 + 70 = 180°
3x + 90 = 180°
3x = 180 - 90
3x = 90
x= 90/3
x=30
B= x+20
=30 + 20
=50° B
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3x+90=180
3x=180-90
3x=90
x=30
BESAR SUDUT B
➡x+20
➡30+20
➡B. 50
NICE TO HELP YOU ^_^
2x + x + 20 + 70 = 180°
3x + 90 = 180°
3x = 180 - 90
3x = 90
x= 90/3
x=30
B= x+20
=30 + 20
=50° B