Question

calcule as medidas dos ângulos marcados

Answer 1

2x+30+x=180
2x+x=180-30
3x=150
x=150/3
x=30°

x+20+3x-10=90
x+3x=90-20+10
4x=80
x=80/4
x=20°

60+2x/3+30=360(mmc)
180+2x+90/2=360(multiplicação cruzada)
2.360=180+2x+90
720=270+2x
720-270=2x
450=2x
x=450/2
x=225