If the angles of a quadrilateral are in the ratio 4 : 7 :13 :12 , find the magnitude of the angles
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let the angles be 4x.7x,13x,12x
sum of angles in quadrilateral=360
4x+7x+13x+12x=360
36x=360
x=10
angles are 4x=4x10=40degree
7x=7x10=70degree
13x=13x10=130degree
12x=12x10=120degree
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