The Total solution for NCERT class 6-12
Three angles of a quadrilateral are 1100,500 and 400
Let the fourth angle be ‘x’
We know, sum of all angles of a quadrilateral = 3600
1100 + 500 + 400 +x0 = 3600
⇒ x = 3600 – 2000
⇒x = 1600
Therefore, the required fourth angle is 1600.