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let first angle be x then other 3 angles are as:
x+d,x+2d,x+3d
then angle sum property of quadrilateral
:: x+x+10+20+x+30=360
4x= 360-60
4x= 300
x = 75 , 85,95,105
x+d,x+2d,x+3d
then angle sum property of quadrilateral
:: x+x+10+20+x+30=360
4x= 360-60
4x= 300
x = 75 , 85,95,105
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