In a quadrilateral ABCD, angle A, angle B, angle C and angleD are respectively in
arithmetic progression and angle C= 100°. Find the remaining three
angles of quadrilateral.
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Answer:
angle A+angle B+angleC+angleD=360
100+x+x+x=360
100+3x=360
3x=360-100
3x=260
x=260/3degree
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