I did not understand plese can anyone tell me about this
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Step-by-step explanation:
w+2w+150+90=360 Angle sum property
3w = 360 -150 -90
3w = 120
w = 120/3
w = 40
2w = 40*2 = 80
Therefore angles are 40,80,90,150
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hence the above state ment proves that 20° is your answer
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