Is it possible for a quadrilateral to have three 60 degree a

Is it possible for a quadrilateral to have three 60 degree angles? Explain.

Solution

No its not possible for a quadilateral to have 3 angles as 60 degree because the sum if internal angle of a quadilateral is 360 degree and if three angles of them are 60 degree each then the fourth angle will be 180 degree which is a straight line so the fourth side with angle as 180 degree will not form a closed figure with other 3 sides hence quadilateral which consist of 4 closed sides is not possible.