Answer:
50
Explanation:
Angle PQS is found by 180-80=100
180- 100-30=50
50 degrees
<PQS +<RQS = 180°(sum of angles in a straight line)
#+80=180
#=180-80
#=100°
30° + x + # = 180°(sum of angles in a Δ)
30+x+100=180
x+130=180
x=180-130
x=50°
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