Answer:
x=30
Step-by-step explanation:
all interior angles in a triangle must equal 180 degrees
2x+30+90=180
2x+120=180
2x=60
x=30
you can check by substituting 30:
2(30)+30+90
60+30+90=180
another way to do this:
3x is an exterior angle
however it is a supplementary one as well
that means tht
3x+90=180
3x=90
x=30
you get the same answer either way
HOPE THIS HELPS!
