Question

determine x dos ângulos abaixo

Answer 1

a)3x-40+2x-40=180
3x+2x=40+40+180
x=260/5
x=52

b) 12x- 6 =180
12x= 180+6
12x=186
x=15,5
c) x-10+x-30=90
2x=90+40
2x=130
×=130/2
x=65
d) 3x+2x =90
5x=90
x=90/5
x=18