Răspuns :
a.
90°+x+x+10°=180°
2x=180-90-10
2x=80
x=40
b.
90+52+80-x=180
80-x=180-90-52
80-x=28
x=80-28
x=52
c.
90+x+16+2x+14=180
3x=180-90-16-14
3x=60
x=20
d.
90+2x+x=180
3x=180-90
3x=90
x=30
succes!
a.
90°+x+x+10°=180°
2x=180-90-10
2x=80
x=40
b.
90+52+80-x=180
80-x=180-90-52
80-x=28
x=80-28
x=52
c.
90+x+16+2x+14=180
3x=180-90-16-14
3x=60
x=20
d.
90+2x+x=180
3x=180-90
3x=90
x=30
succes!